{"id":11799,"date":"2022-08-25T13:07:11","date_gmt":"2022-08-25T07:37:11","guid":{"rendered":"https:\/\/blog.guvi.in\/?p=11799"},"modified":"2026-05-26T13:19:47","modified_gmt":"2026-05-26T07:49:47","slug":"postman-interview-questions","status":"publish","type":"post","link":"https:\/\/www.guvi.in\/blog\/postman-interview-questions\/","title":{"rendered":"Top 55 Postman Interview Questions and Answers (2026), Beginner to Advanced!"},"content":{"rendered":"\n<p>Are you preparing for an API testing or backend role and wondering what kind of Postman questions might come up in your interview? You&#8217;re not alone.&nbsp;<\/p>\n\n\n\n<p>Postman has become the go-to tool for API development and testing, making it an essential skill for developers, QA engineers, and even product teams. From sending your first GET request to chaining complex workflows with dynamic variables and scripts, Postman helps teams build, debug, and monitor APIs efficiently.<\/p>\n\n\n\n<p>Postman is used by over 25 million developers worldwide and is the <strong>most-asked API testing tool in software QA interviews<\/strong>. Whether you&#8217;re a fresher targeting your first QA role or an experienced developer brushing up for a senior position, these 55 Postman interview questions, organized from beginner to advanced, cover everything interviewers actually ask in 2026, including Newman, CI\/CD integration, data-driven testing, authentication, and Postman&#8217;s newest AI-powered features.<\/p>\n\n\n\n<p>In this article, we\u2019ve curated a comprehensive list of the Top 40 Postman Interview Questions that have been categorized into Beginner, Intermediate, and Advanced levels. So, without further ado, let us get started!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>TL;DR, Key Postman Concepts Interviewers Test<br><\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Concept<\/strong><\/td><td><strong>What It Is<\/strong><\/td><\/tr><tr><td><strong>Collections<\/strong><\/td><td>Groups of saved API requests for organized testing<\/td><\/tr><tr><td><strong>Environments<\/strong><\/td><td>Variable sets for switching between Dev \/ Staging \/ Prod<\/td><\/tr><tr><td><strong>Newman<\/strong><\/td><td>Postman&#8217;s CLI runner for CI\/CD pipeline integration<\/td><\/tr><tr><td><strong>Pre-request Scripts<\/strong><\/td><td>JavaScript that runs <em>before<\/em> a request is sent<\/td><\/tr><tr><td><strong>Test Scripts<\/strong><\/td><td>Scheduled, automatic collection runs for API health checks<\/td><\/tr><tr><td><strong>Monitors<\/strong><\/td><td>Scheduled, automatic collection runs for API health checks<\/td><\/tr><tr><td><strong>Mock Servers<\/strong><\/td><td>Simulate API endpoints before the backend is ready<\/td><\/tr><tr><td><strong>Postman Flows<\/strong><\/td><td>Visual, no-code API workflow builder (introduced 2023)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>What is Postman and Why Is It Used in API Testing?<\/strong><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.postman.com\/product\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><strong>Postman<\/strong><\/a> is an API development and testing platform that allows developers and QA engineers to send HTTP requests, automate tests, and manage API collections without writing extensive code. It supports REST, SOAP, and GraphQL APIs and is used by over 25 million developers worldwide, including teams at Microsoft, Salesforce, and Twitter.<\/p>\n\n\n\n<p>In interviews, Postman questions test your ability to:<\/p>\n\n\n\n<ul>\n<li>Design and execute API test cases<\/li>\n\n\n\n<li>Write JavaScript-based test assertions<\/li>\n\n\n\n<li>Integrate API tests into CI\/CD pipelines<\/li>\n\n\n\n<li>Handle authentication, environments, and dynamic data<\/li>\n<\/ul>\n\n\n\n<p><strong><em>Read More: <\/em><\/strong><a href=\"https:\/\/www.guvi.in\/blog\/how-to-use-a-postman-tool\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>How to Use a Postman Tool?<\/em><\/strong><\/a>&nbsp;<br><br><\/p>\n\n\n\n<div style=\"background-color: #099f4e; border: 3px solid #110053; border-radius: 12px; padding: 18px 22px; color: #FFFFFF; font-size: 18px; font-family: Montserrat, Helvetica, sans-serif; line-height: 1.7; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15); max-width: 750px;\">\n  <strong style=\"font-size: 22px; color: #FFFFFF;\">\ud83d\udca1 Did You Know?<\/strong>\n  <br \/><br \/>\n\n  \ud83d\ude80 Postman began as a simple Chrome extension side project in 2012 and has now grown into one of the world\u2019s most popular API platforms, serving <strong style=\"color: #FFFFFF;\">25M+ developers worldwide<\/strong>.\n  <br \/><br \/>\n\n  \ud83d\udd10 Postman includes <strong style=\"color: #FFFFFF;\">Vault Variables<\/strong> for encrypted secret storage, a powerful feature many testers still overlook during API automation and CI\/CD workflows.\n  <br \/><br \/>\n\n  \u2699\ufe0f <strong style=\"color: #FFFFFF;\">Newman<\/strong>, Postman\u2019s CLI runner, returns different exit codes for test failures vs. collection errors, making debugging in Jenkins and GitHub Actions pipelines much easier.\n  <br \/><br \/>\n\n  \ud83d\udd17 You can even add a <strong style=\"color: #FFFFFF;\">\u201cRun in Postman\u201d button<\/strong> to API documentation or websites, allowing developers to import collections with a single click.\n  <br \/><br \/>\n\n  \ud83e\uddea The <strong style=\"color: #FFFFFF;\">Postman Console<\/strong> supports <code style=\"background: rgba(255,255,255,0.15); padding: 2px 6px; border-radius: 4px; color: #fff;\">console.table()<\/code>, making array and object debugging far cleaner and easier than traditional <code style=\"background: rgba(255,255,255,0.15); padding: 2px 6px; border-radius: 4px; color: #fff;\">console.log()<\/code>.\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Core Postman Interview Questions for Fresher and Junior QA Roles<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/01@2x-1200x630.png\" alt=\"Beginner-Level Postman Interview Questions\" class=\"wp-image-79542\" srcset=\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/01@2x-1200x630.png 1200w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/01@2x-300x158.png 300w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/01@2x-768x403.png 768w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/01@2x-1536x806.png 1536w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/01@2x-2048x1075.png 2048w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/01@2x-150x79.png 150w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" title=\"\"><\/figure>\n\n\n\n<p>If you\u2019re just getting started with Postman, interviewers will want to check your understanding of the basics, like how to send a request, use environments, or read a response. These beginner-level questions focus on core concepts and the everyday features you\u2019ll use while testing APIs with Postman.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>1.<\/strong> <strong>What is Postman?<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/02@2x-1200x630.png\" alt=\"What is Postman, and why is it used?\" class=\"wp-image-79544\" srcset=\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/02@2x-1200x630.png 1200w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/02@2x-300x158.png 300w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/02@2x-768x403.png 768w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/02@2x-1536x806.png 1536w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/02@2x-2048x1075.png 2048w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/02@2x-150x79.png 150w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" title=\"\"><\/figure>\n\n\n\n<p><a href=\"https:\/\/www.postman.com\/product\/tools\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\"><strong>Postman<\/strong> <\/a>is an API platform used for building, testing, and documenting APIs. It provides a GUI to send HTTP\/HTTPS requests (GET, POST, PUT, DELETE, PATCH) and inspect responses, without needing to write code. It also supports automated testing via JavaScript test scripts, environment management, and team collaboration through workspaces.<br><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>2. What are the main features of Postman?<\/strong><\/h3>\n\n\n\n<p>Postman&#8217;s key features include:<\/p>\n\n\n\n<ol>\n<li><strong>Collections: <\/strong>&nbsp;Organize and group related API requests<\/li>\n\n\n\n<li><strong>Environments: <\/strong>&nbsp;Manage variables for different configurations (Dev, Staging, Prod)<\/li>\n\n\n\n<li><strong>Test Scripts: <\/strong>Write <a href=\"https:\/\/www.guvi.in\/hub\/javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">JavaScript <\/a>assertions to validate API responses<\/li>\n\n\n\n<li><strong>Mock Servers: <\/strong>&nbsp;Simulate API endpoints during development<\/li>\n\n\n\n<li><strong>Monitors: <\/strong>&nbsp;Schedule automated collection runs for health checks<\/li>\n\n\n\n<li><strong>Newman: <\/strong>&nbsp;CLI runner for CI\/CD pipeline integration<\/li>\n\n\n\n<li><strong>Postman Flows: <\/strong>Visual no-code API workflow builder<\/li>\n\n\n\n<li><strong>API Documentation: <\/strong>Auto-generate docs from collections<\/li>\n<\/ol>\n\n\n\n<p><strong>You May Also Like: <\/strong><a href=\"https:\/\/www.guvi.in\/blog\/manual-testing-interview-questions-and-answers\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Top 100+ Manual Testing Interview Questions and Answers<\/strong><\/a>&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>3. What is an API? How does Postman help in API testing?<\/strong><\/h3>\n\n\n\n<p><strong>API (Application Programming Interface)<\/strong> is a set of rules that allows one software application to communicate with another. Postman helps in API testing by providing a user-friendly interface to send requests to API endpoints, inspect responses, automate test assertions, and manage test data,&nbsp; eliminating the need for manual command-line testing using tools like cURL.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>4. What are HTTP methods? Which ones does Postman support?<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>HTTP Method<\/strong><\/td><td><strong>Purpose<\/strong><\/td><\/tr><tr><td><strong>GET<\/strong><\/td><td>Retrieve data from a server<\/td><\/tr><tr><td><strong>POST<\/strong><\/td><td>Send\/create new data on a server<\/td><\/tr><tr><td><strong>PUT<\/strong><\/td><td>Update an entire existing resource<\/td><\/tr><tr><td><strong>PATCH<\/strong><\/td><td>Update part of an existing resource<\/td><\/tr><tr><td><strong>DELETE<\/strong><\/td><td>Remove a resource from the server<\/td><\/tr><tr><td><strong>HEAD<\/strong><\/td><td>Like GET but returns headers only (no body)<\/td><\/tr><tr><td><strong>OPTIONS<\/strong><\/td><td>Returns supported HTTP methods for a URL<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Postman supports all standard HTTP methods, including GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>5. What is a Postman Collection?<\/strong><\/h3>\n\n\n\n<p>A <strong>Postman Collection<\/strong> is a group of saved API requests organized into folders. Collections let you group related requests (e.g., all user authentication endpoints), run them in sequence using the Collection Runner, share them with teammates, and export them as JSON for version control. Collections are the core unit of organization in Postman.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>6. What is the difference between a request and a collection in Postman?<\/strong><\/h3>\n\n\n\n<p>A <strong>request<\/strong> is a single API call (e.g., GET \/users). A <strong>collection<\/strong> is a container that holds multiple related requests, organized into folders. Collections can be run as a batch using the Collection Runner or Newman CLI, making them the foundation of automated API testing in Postman.<\/p>\n\n\n\n<p><strong>Find out: <\/strong><a href=\"https:\/\/www.guvi.in\/blog\/limitations-in-automation-testing\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>10 Common Limitations in Automation Testing<\/strong><\/a>&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>7. What is a Postman Workspace?<\/strong><\/h3>\n\n\n\n<p>A <strong>Postman Workspace<\/strong> is a collaborative environment where teams can organize and share collections, environments, APIs, and mock servers. Workspaces can be <strong>Personal<\/strong> (only you), <strong>Team<\/strong> (shared with teammates), or <strong>Public<\/strong> (open to everyone). They enable collaboration without needing to export and re-import collections manually.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>8. What are Postman environments?<\/strong><\/h3>\n\n\n\n<p>A <strong>Postman Environment<\/strong> is a set of key-value variable pairs used to switch between different configurations (Dev, Staging, Production) without modifying individual requests. For example, instead of hardcoding https:\/\/dev.api.example.com, you set a variable {{base_url}} and define its value differently per environment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>9. How do you send a GET request in Postman?<\/strong><\/h3>\n\n\n\n<ol>\n<li>Open Postman and click <strong>New Request<\/strong><\/li>\n\n\n\n<li>Select <strong>GET<\/strong> from the HTTP method dropdown<\/li>\n\n\n\n<li>Enter the API endpoint URL (e.g., https:\/\/api.example.com\/users)<\/li>\n\n\n\n<li>Click <strong>Send<\/strong><\/li>\n\n\n\n<li>View the response body, status code, headers, and response time in the bottom panel<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>10. What is the purpose of the Postman Console?<\/strong><\/h3>\n\n\n\n<p>The <strong>Postman Console<\/strong> (View \u2192 Show Postman Console) is a debugging panel that logs all HTTP requests and responses, including headers, body, and pre-request\/test script output. It is the first place you check when a request isn&#8217;t behaving as expected. You can also use console.log() in scripts to print values for debugging.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>11. What response codes do you commonly verify in Postman tests?<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Status Code<\/strong><\/td><td><strong>Meaning<\/strong><\/td><\/tr><tr><td><strong>200 OK<\/strong><\/td><td>Request succeeded<\/td><\/tr><tr><td><strong>201 Created<\/strong><\/td><td>Resource successfully created (POST)<\/td><\/tr><tr><td><strong>400 Bad Request<\/strong><\/td><td>Client sent invalid request data<\/td><\/tr><tr><td><strong>401 Unauthorized<\/strong><\/td><td>Authentication is required or failed<\/td><\/tr><tr><td><strong>403 Forbidden<\/strong><\/td><td>Authenticated but not allowed<\/td><\/tr><tr><td><strong>404 Not Found<\/strong><\/td><td>Resource doesn&#8217;t exist<\/td><\/tr><tr><td><strong>500 Internal Server Error<\/strong><\/td><td>Server-side failure<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>12. How do you add query parameters in Postman?<\/strong><\/h3>\n\n\n\n<p>In Postman, you can add query parameters two ways:<\/p>\n\n\n\n<ul>\n<li><strong>Method 1:<\/strong> Type them directly in the URL: https:\/\/api.example.com\/users?page=1&amp;limit=10<\/li>\n\n\n\n<li><strong>Method 2:<\/strong> Click the <strong>Params<\/strong> tab below the URL bar and add key-value pairs, Postman automatically appends them to the URL<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>13. What is the difference between path variables and query parameters?<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><\/td><td><strong>Path Variable<\/strong><\/td><td><strong>Query Parameter<\/strong><\/td><\/tr><tr><td><strong>Location<\/strong><\/td><td>Embedded in the URL path<\/td><td>Appended after ?<\/td><\/tr><tr><td><strong>Example<\/strong><\/td><td>\/users\/:id \u2192 \/users\/42<\/td><td>\/users?id=42<\/td><\/tr><tr><td><strong>Required<\/strong><\/td><td>Usually required<\/td><td>Usually optional<\/td><\/tr><tr><td><strong>Used for<\/strong><\/td><td>Identifying a specific resource<\/td><td>Filtering, sorting, pagination<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>14. How do you add headers to a request in Postman?<\/strong><\/h3>\n\n\n\n<p>Click the <strong>Headers<\/strong> tab in the request builder and add key-value pairs. Common headers include:<\/p>\n\n\n\n<ul>\n<li>Content-Type: application\/json<strong>:<\/strong> tells the server the request body format<\/li>\n\n\n\n<li>Authorization: Bearer &lt;token&gt;<strong>:<\/strong> &nbsp; passes authentication tokens<\/li>\n\n\n\n<li>Accept: application\/json<strong>:<\/strong>&nbsp; specifies the expected response format<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>15. Is Postman free to use?<\/strong><\/h3>\n\n\n\n<p>Yes. Postman offers a <strong>free tier<\/strong> that includes unlimited collections, environments, and API calls for individuals. Paid plans (Basic, Professional, Enterprise) add features like team collaboration, advanced mock servers, custom domains for documentation, and priority support. For most interview prep and individual API testing, the free tier is sufficient.<\/p>\n\n\n\n<p><em><strong>Read More: <\/strong><\/em><a href=\"https:\/\/www.guvi.in\/blog\/how-to-use-a-postman-tool\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong><em>How to Use a Postman Tool?<\/em><\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><br><strong>Intermediate Postman Questions That Separate Hireable Candidates From the Rest<\/strong><\/h2>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/03@2x-1200x630.png\" alt=\"Intermediate-Level Postman Interview Questions\" class=\"wp-image-79545\" srcset=\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/03@2x-1200x630.png 1200w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/03@2x-300x158.png 300w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/03@2x-768x403.png 768w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/03@2x-1536x806.png 1536w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/03@2x-2048x1075.png 2048w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/03@2x-150x79.png 150w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" title=\"\"><\/figure>\n\n\n\n<p>Once you\u2019ve mastered the basics, interviewers will dig deeper into how you manage workflows, write scripts, and automate testing.&nbsp;<\/p>\n\n\n\n<p>These intermediate questions test your hands-on experience with Postman\u2019s more powerful features like chaining requests, environment variables, pre-request\/test scripts, and the Collection Runner.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>16. What are variables in Postman? What are the different types?<\/strong><\/h3>\n\n\n\n<p><strong>Postman variables<\/strong> store reusable values (like base URLs, tokens, or IDs) that can be referenced across requests using double curly braces: {{variable_name}}.,<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Variable Type<\/strong><\/td><td><strong>Scope<\/strong><\/td><td><strong>Persists After Run?<\/strong><\/td><td><strong>Best Use Case<\/strong><\/td><\/tr><tr><td><strong>Global<\/strong><\/td><td>All collections &amp; environments<\/td><td>Yes<\/td><td>Constants shared across everything<\/td><\/tr><tr><td><strong>Environment<\/strong><\/td><td>Specific environment only<\/td><td>Yes<\/td><td>Dev \/ Staging \/ Prod config values<\/td><\/tr><tr><td><strong>Collection<\/strong><\/td><td>Within one collection<\/td><td>Yes<\/td><td>Collection-level shared data<\/td><\/tr><tr><td><strong>Local<\/strong><\/td><td>Single request or script<\/td><td>No<\/td><td>Temporary, per-request calculation<\/td><\/tr><tr><td><strong>Data<\/strong><\/td><td>From external file (CSV\/JSON)<\/td><td>No<\/td><td>Data-driven testing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>17. What is the difference between global, environment, and local variables?<\/strong><\/h3>\n\n\n\n<p><strong>Global variables<\/strong> in Postman are accessible across all collections and workspaces, making them ideal for constants shared everywhere (e.g., API version). <strong>Environment variables<\/strong> are scoped to a specific environment (<a href=\"https:\/\/www.guvi.in\/blog\/what-is-devops\/\" target=\"_blank\" rel=\"noreferrer noopener\">Dev<\/a>, Staging, Production), allowing you to switch configurations without modifying individual requests. <strong>Local variables<\/strong> exist only during a single request or script execution and are discarded afterward.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>18. How do you set and retrieve a variable in a Postman script?<\/strong><\/h3>\n\n\n\n<p>\/\/ Set an environment variable<\/p>\n\n\n\n<p>pm.environment.set(&#8220;authToken&#8221;, &#8220;eyJhbGciOiJIUzI1NiJ9&#8230;&#8221;);<\/p>\n\n\n\n<p>\/\/ Set a global variable<\/p>\n\n\n\n<p>pm.globals.set(&#8220;userId&#8221;, &#8220;12345&#8221;);<\/p>\n\n\n\n<p>\/\/ Set a local (temporary) variable<\/p>\n\n\n\n<p>pm.variables.set(&#8220;tempValue&#8221;, &#8220;abc&#8221;);<\/p>\n\n\n\n<p>\/\/ Get\/retrieve a variable<\/p>\n\n\n\n<p>const token = pm.environment.get(&#8220;authToken&#8221;);<\/p>\n\n\n\n<p>const id = pm.globals.get(&#8220;userId&#8221;);<\/p>\n\n\n\n<p>\/\/ Log to Postman Console for debugging<\/p>\n\n\n\n<p>console.log(&#8220;Token is:&#8221;, token);<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>19. What are pre-request scripts in Postman and when should you use them?<\/strong><\/h3>\n\n\n\n<p><strong>Pre-request scripts<\/strong> are JavaScript code that runs <em>before<\/em> a request is sent. They are used to:<\/p>\n\n\n\n<ul>\n<li>Generate dynamic data (timestamps, random IDs)<\/li>\n\n\n\n<li>Set authentication tokens before each request<\/li>\n\n\n\n<li>Chain requests by passing data from one call to the next<\/li>\n\n\n\n<li>Perform calculations needed in the request body<\/li>\n<\/ul>\n\n\n\n<p>\/\/ Example: Generate a timestamp before sending<\/p>\n\n\n\n<p>const timestamp = new Date().toISOString();<\/p>\n\n\n\n<p>pm.environment.set(&#8220;currentTimestamp&#8221;, timestamp);<\/p>\n\n\n\n<p>\/\/ Example: Generate a random user ID<\/p>\n\n\n\n<p>const randomId = Math.floor(Math.random() * 10000);<\/p>\n\n\n\n<p>pm.environment.set(&#8220;randomUserId&#8221;, randomId);<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>20. What are test scripts in Postman?<\/strong><\/h3>\n\n\n\n<p><strong>Test scripts<\/strong> are JavaScript code that runs <em>after<\/em> a response is received. They validate that the API behaved as expected by asserting response status codes, body content, response time, and header values using Postman&#8217;s pm.test() and pm.expect() methods.<\/p>\n\n\n\n<p>\/\/ Check status code is 200<\/p>\n\n\n\n<p>pm.test(&#8220;Status code is 200&#8221;, function () {<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.response.to.have.status(200);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<p>\/\/ Check response body contains expected field<\/p>\n\n\n\n<p>pm.test(&#8220;Response has user ID&#8221;, function () {<\/p>\n\n\n\n<p>&nbsp;&nbsp;const jsonData = pm.response.json();<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.expect(jsonData).to.have.property(&#8220;id&#8221;);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<p>\/\/ Check response time is under 500ms<\/p>\n\n\n\n<p>pm.test(&#8220;Response time is acceptable&#8221;, function () {<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.expect(pm.response.responseTime).to.be.below(500);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<p>\/\/ Check a specific field value<\/p>\n\n\n\n<p>pm.test(&#8220;User email is correct&#8221;, function () {<\/p>\n\n\n\n<p>&nbsp;&nbsp;const jsonData = pm.response.json();<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.expect(jsonData.email).to.eql(&#8220;test@example.com&#8221;);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>21. How do you chain requests in Postman using variables?<\/strong><\/h3>\n\n\n\n<p>Request chaining passes data from one request&#8217;s response to the next request automatically. For example, after a login request returns an authToken, you capture it and use it in subsequent requests:<\/p>\n\n\n\n<p>\/\/ In the Test Script of your LOGIN request:<\/p>\n\n\n\n<p>pm.test(&#8220;Capture auth token&#8221;, function () {<\/p>\n\n\n\n<p>&nbsp;&nbsp;const jsonData = pm.response.json();<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.environment.set(&#8220;authToken&#8221;, jsonData.token);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<p>Then in the next request, use {{authToken}} in the Authorization header, Postman automatically injects the captured value.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>22. What is the Postman Collection Runner?<\/strong><\/h3>\n\n\n\n<p>The <strong>Collection Runner<\/strong> is a built-in Postman tool that executes all requests in a collection sequentially or in a defined order. It allows you to:<\/p>\n\n\n\n<ul>\n<li>Run all tests in a collection at once<\/li>\n\n\n\n<li>Use a CSV or JSON data file for data-driven testing<\/li>\n\n\n\n<li>Set the number of iterations<\/li>\n\n\n\n<li>View pass\/fail results for each request in a single dashboard<\/li>\n<\/ul>\n\n\n\n<p>Access it via <strong>Runner<\/strong> button in the top toolbar.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>23. What are Postman Monitors?<\/strong><\/h3>\n\n\n\n<p><strong>Postman Monitors<\/strong> are scheduled, automated runs of a Postman collection. They allow you to continuously test your API&#8217;s health, performance, and correctness at defined intervals (every 5 minutes, hourly, daily). Monitors run in the cloud and send alerts when a test fails,&nbsp; acting as an API uptime checker. They are particularly useful for catching regressions in production APIs.<\/p>\n\n\n\n<p><strong>Want to go beyond Postman?<\/strong> Learn how Newman, Docker, and Jenkins work together in production HCL GUVI\u00a0 <a href=\"https:\/\/www.guvi.in\/zen-class\/devops-course\/?utm_source=blog&amp;utm_medium=hyperlink&amp;utm_campaign=postman-interview-questions\" target=\"_blank\" rel=\"noreferrer noopener\">DevOps Course<\/a>, available in Tamil &amp; English.<a href=\"https:\/\/www.guvi.in\/zen-class\/devops-course\/\">\u00a0<\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>24. What are Mock Servers in Postman?<\/strong><\/h3>\n\n\n\n<p>A <strong>Mock Server<\/strong> in Postman simulates an API endpoint before the actual backend is built. Developers can define expected request-response pairs using <strong>examples<\/strong>, and Postman generates a mock URL that returns those responses. This enables frontend and backend teams to work in parallel without waiting for the real API to be ready.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>25. What is the difference between a mock server and a real server?<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><\/td><td><strong>Mock Server<\/strong><\/td><td><strong>Real Server<\/strong><\/td><\/tr><tr><td><strong>Data<\/strong><\/td><td>Returns predefined, static example<\/td><td>Returns live, dynamic data<\/td><\/tr><tr><td><strong>Purpose<\/strong><\/td><td>Development &amp; early-stage testing<\/td><td>Integration &amp; production testing<\/td><\/tr><tr><td><strong>Speed<\/strong><\/td><td>Instant setup, no backend needed<\/td><td>Requires backend to be running<\/td><\/tr><tr><td><strong>Use Case<\/strong><\/td><td>Parallel development, contract testing<\/td><td>End-to-end, regression testing<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>26. How do you handle authentication in Postman API testing?<\/strong><\/h3>\n\n\n\n<p>Postman supports multiple authentication methods. You configure them under the <strong>Authorization<\/strong> tab of a request or at the collection level (so all requests inherit it):<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Auth Type<\/strong><\/td><td><strong>How It Works<\/strong><\/td><\/tr><tr><td><strong>No Auth<\/strong><\/td><td>Public APIs requiring no authentication<\/td><\/tr><tr><td><strong>API Key<\/strong><\/td><td>Key sent in header or query parameter<\/td><\/tr><tr><td><strong>Basic Auth<\/strong><\/td><td>Base64-encoded username:password in header<\/td><\/tr><tr><td><strong>Bearer Token<\/strong><\/td><td>Token sent in Authorization: Bearer &lt;token&gt; header<\/td><\/tr><tr><td><strong>OAuth 1.0<\/strong><\/td><td>Signs requests with a cryptographic signature<\/td><\/tr><tr><td><strong>OAuth 2.0<\/strong><\/td><td>Token-based; supports Authorization Code, Client Credentials flows<\/td><\/tr><tr><td><strong>AWS Signature<\/strong><\/td><td>AWS-specific signing mechanism<\/td><\/tr><tr><td><strong>NTLM \/ Hawk<\/strong><\/td><td>Windows \/ specialized auth protocols<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Best practice:<\/strong> Set auth at the Collection level and use {{authToken}} variables,&nbsp; this avoids repeating credentials in every request.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>27. What is OAuth 2.0 and how do you configure it in Postman?<\/strong><\/h3>\n\n\n\n<p><strong>OAuth 2.0<\/strong> is an authorization framework that allows apps to access resources on behalf of a user without exposing credentials. In Postman:<\/p>\n\n\n\n<ol>\n<li>Go to <strong>Authorization<\/strong> tab \u2192 Select <strong>OAuth 2.0<\/strong><\/li>\n\n\n\n<li>Click <strong>Get New Access Token<\/strong><\/li>\n\n\n\n<li>Enter: Grant Type, Callback URL, Auth URL, Access Token URL, Client ID, and Client Secret<\/li>\n\n\n\n<li>Click <strong>Request Token<\/strong>,&nbsp; Postman handles the token exchange<\/li>\n\n\n\n<li>Use the token in subsequent requests automatically<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>28. What is Postman&#8217;s Collection-level authorization?<\/strong><\/h3>\n\n\n\n<p>When you set authorization at the <strong>Collection<\/strong> level, all requests inside that collection automatically inherit those credentials. Individual requests can override this by selecting a different auth type. This is best practice for large collections,&nbsp; it avoids repeating the same token configuration across dozens of requests and makes token rotation easier.<\/p>\n\n\n\n<p><strong>Explore: <\/strong><a href=\"https:\/\/www.guvi.in\/blog\/what-is-automation-testing\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Automation Testing 101: An Informative Guide<\/strong><\/a>&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>29. How do you import and export collections in Postman?<\/strong><\/h3>\n\n\n\n<ul>\n<li><strong>Export:<\/strong> Right-click a collection \u2192 <strong>Export<\/strong> \u2192 choose Collection v2.1 format \u2192 saves as JSON<\/li>\n\n\n\n<li><strong>Import:<\/strong> Click <strong>Import<\/strong> in the top left \u2192 drag and drop the JSON file or paste a URL<\/li>\n\n\n\n<li>Collections can also be shared via a <strong>public link<\/strong> or synced through a <strong>Postman Workspace<\/strong> for team collaboration<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>30. Can Postman test GraphQL APIs?<\/strong><\/h3>\n\n\n\n<p>Yes. Postman has <strong>built-in GraphQL support<\/strong>. To test a GraphQL API:<\/p>\n\n\n\n<ol>\n<li>Create a new request and set the URL to your GraphQL endpoint<\/li>\n\n\n\n<li>Select <strong>GraphQL<\/strong> as the request body type<\/li>\n\n\n\n<li>Write your query in the Query editor,&nbsp; Postman auto-fetches the schema for autocomplete<\/li>\n<\/ol>\n\n\n\n<p>Add variables in the <strong>GraphQL Variables<\/strong> section<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Advanced Postman Interview Questions for Experienced Professionals<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1200\" height=\"630\" src=\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/04@2x-1200x630.png\" alt=\"Advanced-Level Postman Interview Questions\" class=\"wp-image-79546\" srcset=\"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/04@2x-1200x630.png 1200w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/04@2x-300x158.png 300w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/04@2x-768x403.png 768w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/04@2x-1536x806.png 1536w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/04@2x-2048x1075.png 2048w, https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2025\/05\/04@2x-150x79.png 150w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" title=\"\"><\/figure>\n\n\n\n<p>At the advanced level, it&#8217;s all about real-world problem-solving. These questions assess your ability to handle dynamic data, automate token refresh, integrate Postman into <a href=\"https:\/\/www.guvi.in\/blog\/understanding-ci-cd\/\" target=\"_blank\" rel=\"noreferrer noopener\">CI\/CD pipelines<\/a>, and debug efficiently.<br><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>31. What is Newman in Postman and How Is It Used in CI\/CD?<\/strong><\/h3>\n\n\n\n<p><strong>Newman<\/strong> is Postman&#8217;s open-source command-line collection runner that allows you to execute Postman collections directly from the terminal,&nbsp; without opening the Postman GUI. It is the primary tool for integrating Postman API tests into CI\/CD pipelines like Jenkins, GitHub Actions, CircleCI, and GitLab CI.<\/p>\n\n\n\n<p><strong>Install Newman:<\/strong><\/p>\n\n\n\n<p>npm install -g newman<\/p>\n\n\n\n<p><strong>Run a collection:<\/strong><\/p>\n\n\n\n<p>newman run MyCollection.json<\/p>\n\n\n\n<p><strong>Run with an environment file:<\/strong><\/p>\n\n\n\n<p>newman run MyCollection.json -e dev-environment.json<\/p>\n\n\n\n<p><strong>Run with a data file (data-driven testing):<\/strong><\/p>\n\n\n\n<p>newman run MyCollection.json -d testdata.csv &#8211;reporters cli,htmlextra<\/p>\n\n\n\n<p><strong>Generate an HTML report:<\/strong><\/p>\n\n\n\n<p>npm install -g newman-reporter-htmlextra<\/p>\n\n\n\n<p>newman run MyCollection.json &#8211;reporters htmlextra &#8211;reporter-htmlextra-export report.html<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>32. How do you integrate Postman\/Newman with GitHub Actions?<\/strong><\/h3>\n\n\n\n<p># .github\/workflows\/api-tests.yml<\/p>\n\n\n\n<p>name: API Tests with Newman<\/p>\n\n\n\n<p>on: [push, pull_request]<\/p>\n\n\n\n<p>jobs:<\/p>\n\n\n\n<p>&nbsp;&nbsp;newman-tests:<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;runs-on: ubuntu-latest<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;steps:<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8211; uses: actions\/checkout@v3<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8211; name: Install Node.js<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;uses: actions\/setup-node@v3<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with:<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;node-version: &#8217;18&#8217;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8211; name: Install Newman<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;run: npm install -g newman newman-reporter-htmlextra<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8211; name: Run Postman Collection<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;run: |<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;newman run .\/collections\/MyAPI.json \\<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-e .\/environments\/staging.json \\<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8211;reporters cli,htmlextra \\<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8211;reporter-htmlextra-export results\/report.html<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#8211; name: Upload Report<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;uses: actions\/upload-artifact@v3<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;with:<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;name: newman-report<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;path: results\/report.html<\/p>\n\n\n\n<p><strong>Also Read: <\/strong><a href=\"https:\/\/www.guvi.in\/blog\/software-testing-vs-quality-assurance\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Software Testing vs. Quality Assurance (QA)<\/strong><\/a>&nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>33. How do you integrate Postman with Jenkins CI\/CD?<\/strong><\/h3>\n\n\n\n<ol>\n<li>Install <strong>Node.js<\/strong> and <strong>Newman<\/strong> on the Jenkins agent: npm install -g newman<\/li>\n\n\n\n<li>Export your Postman collection and environment as JSON files and commit them to your repository<\/li>\n\n\n\n<li>In the Jenkins pipeline, add a build step to run Newman:<\/li>\n<\/ol>\n\n\n\n<p>\/\/ Jenkinsfile<\/p>\n\n\n\n<p>pipeline {<\/p>\n\n\n\n<p>&nbsp;&nbsp;agent any<\/p>\n\n\n\n<p>&nbsp;&nbsp;stages {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;stage(&#8216;API Tests&#8217;) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;steps {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;sh &#8216;newman run collections\/MyAPI.json -e environments\/staging.json &#8211;reporters cli,junit &#8211;reporter-junit-export results\/newman-report.xml&#8217;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;stage(&#8216;Publish Results&#8217;) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;steps {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;junit &#8216;results\/newman-report.xml&#8217;<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;}<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<p><strong>Postman is only one piece of the DevOps pipeline. If you want to confidently answer how Newman fits into Jenkins or GitHub Actions in a real interview, HCL GUVI <\/strong><a href=\"https:\/\/www.guvi.in\/zen-class\/devops-course\/?utm_source=blog&amp;utm_medium=hyperlink&amp;utm_campaign=postman-interview-questions\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Advanced DevOps &amp; Cloud Engineering Course <\/strong><\/a><strong>covers CI\/CD, Docker, Kubernetes, and more,\u00a0 with hands-on projects and placement support.<\/strong><a href=\"https:\/\/www.guvi.in\/zen-class\/devops-course\/\"><strong>\u00a0<\/strong><\/a><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>34. What is data-driven testing in Postman?<\/strong><\/h3>\n\n\n\n<p><strong>Data-driven testing<\/strong> runs the same API request multiple times with different input values, sourced from an external CSV or JSON file. This lets you test an endpoint against many data sets in one automated run rather than creating separate requests for each test case.<\/p>\n\n\n\n<p><strong>Step-by-step setup:<\/strong><\/p>\n\n\n\n<ol>\n<li>Create a CSV file (testdata.csv):<\/li>\n<\/ol>\n\n\n\n<p>username,password,expectedStatus<\/p>\n\n\n\n<p>admin,password123,200<\/p>\n\n\n\n<p>user1,wrongpass,401<\/p>\n\n\n\n<p>,empty,400<\/p>\n\n\n\n<ol start=\"2\">\n<li><br>In your Postman test script, use {{username}} and {{password}} as variables in the request body.<br><\/li>\n\n\n\n<li>In <strong>Collection Runner<\/strong>, upload the CSV under <strong>Data File<\/strong> and set <strong>Iterations<\/strong> to the number of rows.<br><\/li>\n\n\n\n<li>Via Newman CLI:<br><\/li>\n<\/ol>\n\n\n\n<p>newman run MyCollection.json -d testdata.csv<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>35. What are JavaScript assertion libraries available in Postman test scripts?<\/strong><\/h3>\n\n\n\n<p>Postman uses <strong>ChaiJS<\/strong> as its underlying assertion library, exposed through the pm.expect() API. Common assertions:<\/p>\n\n\n\n<p>const data = pm.response.json();<\/p>\n\n\n\n<p>\/\/ Type checks<\/p>\n\n\n\n<p>pm.expect(data.id).to.be.a(&#8216;number&#8217;);<\/p>\n\n\n\n<p>pm.expect(data.name).to.be.a(&#8216;string&#8217;);<\/p>\n\n\n\n<p>\/\/ Value checks<\/p>\n\n\n\n<p>pm.expect(data.status).to.equal(&#8216;active&#8217;);<\/p>\n\n\n\n<p>pm.expect(data.items).to.have.lengthOf(3);<\/p>\n\n\n\n<p>\/\/ Inclusion checks<\/p>\n\n\n\n<p>pm.expect(data.roles).to.include(&#8216;admin&#8217;);<\/p>\n\n\n\n<p>pm.expect(data).to.have.property(&#8217;email&#8217;);<\/p>\n\n\n\n<p>\/\/ Negation<\/p>\n\n\n\n<p>pm.expect(data.error).to.be.undefined;<\/p>\n\n\n\n<p>\/\/ Nested checks<\/p>\n\n\n\n<p>pm.expect(data.address.city).to.equal(&#8216;Chennai&#8217;);<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>36. How do you write a test to validate a JSON schema in Postman?<\/strong><\/h3>\n\n\n\n<p>const schema = {<\/p>\n\n\n\n<p>&nbsp;&nbsp;type: &#8220;object&#8221;,<\/p>\n\n\n\n<p>&nbsp;&nbsp;required: [&#8220;id&#8221;, &#8220;name&#8221;, &#8220;email&#8221;],<\/p>\n\n\n\n<p>&nbsp;&nbsp;properties: {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;id: { type: &#8220;number&#8221; },<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;name: { type: &#8220;string&#8221; },<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;email: { type: &#8220;string&#8221;, format: &#8220;email&#8221; },<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;active: { type: &#8220;boolean&#8221; }<\/p>\n\n\n\n<p>&nbsp;&nbsp;}<\/p>\n\n\n\n<p>};<\/p>\n\n\n\n<p>pm.test(&#8220;Response matches JSON schema&#8221;, function () {<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.response.to.have.jsonSchema(schema);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>37. How do you handle dynamic tokens and session management in Postman?<\/strong><\/h3>\n\n\n\n<p>Use a <strong>pre-request script at the collection level<\/strong> to check if a token exists and is valid; if not, send a fresh login request and store the new token:<\/p>\n\n\n\n<p>\/\/ Collection-level pre-request script<\/p>\n\n\n\n<p>const token = pm.environment.get(&#8220;authToken&#8221;);<\/p>\n\n\n\n<p>const tokenExpiry = pm.environment.get(&#8220;tokenExpiry&#8221;);<\/p>\n\n\n\n<p>if (!token || Date.now() &gt; tokenExpiry) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.sendRequest({<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;url: pm.environment.get(&#8220;base_url&#8221;) + &#8220;\/auth\/login&#8221;,<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;method: &#8220;POST&#8221;,<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;header: { &#8220;Content-Type&#8221;: &#8220;application\/json&#8221; },<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;body: {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mode: &#8220;raw&#8221;,<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;raw: JSON.stringify({<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;username: pm.environment.get(&#8220;username&#8221;),<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;password: pm.environment.get(&#8220;password&#8221;)<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;})<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;}<\/p>\n\n\n\n<p>&nbsp;&nbsp;}, function (err, response) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;const json = response.json();<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;pm.environment.set(&#8220;authToken&#8221;, json.token);<\/p>\n\n\n\n<p>&nbsp;&nbsp;&nbsp;&nbsp;pm.environment.set(&#8220;tokenExpiry&#8221;, Date.now() + 3600000); \/\/ 1 hour<\/p>\n\n\n\n<p>&nbsp;&nbsp;});<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>38. What is <\/strong><strong>pm.sendRequest()<\/strong><strong> and when would you use it?<\/strong><\/h3>\n\n\n\n<p>pm.sendRequest() allows you to send an asynchronous HTTP request from within a Postman script (pre-request or test script) without creating a separate request in your collection. Common use cases:<\/p>\n\n\n\n<ul>\n<li>Fetching an auth token before your main request runs<\/li>\n\n\n\n<li>Seeding test data before a test<\/li>\n\n\n\n<li>Cleaning up resources after a test (e.g., deleting a created user)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>39. How do you handle pagination in Postman testing?<\/strong><\/h3>\n\n\n\n<p>Use a <strong>loop in a pre-request script<\/strong> combined with a counter variable to iterate through pages:<\/p>\n\n\n\n<p>\/\/ Test script&nbsp; capture next page and loop<\/p>\n\n\n\n<p>const response = pm.response.json();<\/p>\n\n\n\n<p>const currentPage = pm.environment.get(&#8220;currentPage&#8221;) || 1;<\/p>\n\n\n\n<p>if (response.hasNextPage) {<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.environment.set(&#8220;currentPage&#8221;, currentPage + 1);<\/p>\n\n\n\n<p>&nbsp;&nbsp;postman.setNextRequest(&#8220;Get Users&#8221;); \/\/ Loop back to same request<\/p>\n\n\n\n<p>} else {<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.environment.set(&#8220;currentPage&#8221;, 1);<\/p>\n\n\n\n<p>&nbsp;&nbsp;postman.setNextRequest(null); \/\/ Stop the collection run<\/p>\n\n\n\n<p>}<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>40. What is <\/strong><strong>postman.setNextRequest()<\/strong><strong> and how does it work?<\/strong><\/h3>\n\n\n\n<p>postman.setNextRequest(&#8220;Request Name&#8221;) controls the execution flow inside a Collection Runner. It overrides the default sequential execution and jumps to a named request next. Using postman.setNextRequest(null) stops execution immediately. It is used for:<\/p>\n\n\n\n<ul>\n<li>Creating conditional workflows (&#8220;if login fails, skip checkout tests&#8221;)<\/li>\n\n\n\n<li>Building loops (as shown in pagination example above)<\/li>\n\n\n\n<li>Skipping irrelevant requests based on environment or response<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Postman Newman Interview Questions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>41. What are the most commonly used Newman CLI flags?<\/strong><\/h3>\n\n\n\n<p># Basic run<\/p>\n\n\n\n<p>newman run collection.json<\/p>\n\n\n\n<p># With environment<\/p>\n\n\n\n<p>newman run collection.json -e environment.json<\/p>\n\n\n\n<p># With data file<\/p>\n\n\n\n<p>newman run collection.json -d data.csv<\/p>\n\n\n\n<p># Set number of iterations<\/p>\n\n\n\n<p>newman run collection.json -n 5<\/p>\n\n\n\n<p># Set request timeout (ms)<\/p>\n\n\n\n<p>newman run collection.json &#8211;timeout-request 5000<\/p>\n\n\n\n<p># Multiple reporters<\/p>\n\n\n\n<p>newman run collection.json &#8211;reporters cli,junit,htmlextra<\/p>\n\n\n\n<p># Export JUnit XML (for Jenkins)<\/p>\n\n\n\n<p>newman run collection.json &#8211;reporter-junit-export results.xml<\/p>\n\n\n\n<p># Bail on first failure<\/p>\n\n\n\n<p>newman run collection.json &#8211;bail<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>42. What reporters does Newman support?<\/strong><br><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Reporter<\/strong><\/td><td><strong>Use Case<\/strong><\/td><\/tr><tr><td>cli<\/td><td>Default; prints results to terminal<\/td><\/tr><tr><td>json<\/td><td>Outputs raw JSON results<\/td><\/tr><tr><td>junit<\/td><td>JUnit XML format for Jenkins\/<a href=\"https:\/\/www.guvi.in\/blog\/understanding-ci-cd\/\" target=\"_blank\" rel=\"noreferrer noopener\">CI <\/a>integration<\/td><\/tr><tr><td>htmlextra<\/td><td>Rich HTML report with graphs (install separately)<\/td><\/tr><tr><td>csv<\/td><td>Exports results as CSV<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Install htmlextra: npm install -g newman-reporter-htmlextra<br><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Postman Collections, Environments, and Variables,&nbsp; Interview Questions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>43. How do you share collections with your team in Postman?<\/strong><\/h3>\n\n\n\n<p>There are three ways to share Postman collections:<\/p>\n\n\n\n<ol>\n<li><strong>Postman Workspace:<\/strong> Add teammates to a shared workspace; collections sync automatically<\/li>\n\n\n\n<li><strong>Export as JSON: <\/strong>Export the collection file and share via email, Slack, or version control (Git)<\/li>\n\n\n\n<li><strong>Public Link: <\/strong>Generate a shareable link via <strong>Share Collection \u2192 Get public link<\/strong> (read-only for recipients)<\/li>\n<\/ol>\n\n\n\n<p>Best practice for teams: Use a <strong>shared Team Workspace<\/strong> with Git sync so all changes are versioned.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>44. How do you use environment variables to switch between Dev, Staging, and Production?<\/strong><\/h3>\n\n\n\n<ol>\n<li>Create three environments in Postman: Dev, Staging, Production<\/li>\n\n\n\n<li>In each, set the variable base_url with the corresponding URL:\n<ul>\n<li>Dev: https:\/\/dev.api.myapp.com<\/li>\n\n\n\n<li>Staging: https:\/\/staging.api.myapp.com<\/li>\n\n\n\n<li>Production: https:\/\/api.myapp.com<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>In every request, use {{base_url}}\/endpoint instead of a hardcoded URL<\/li>\n\n\n\n<li>Switch environments using the dropdown in the top-right corner,&nbsp; all requests update instantly<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>45. What is the difference between &#8220;Initial Value&#8221; and &#8220;Current Value&#8221; in Postman variables?<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><\/td><td><strong>Initial Value<\/strong><\/td><td><strong>Current Value<\/strong><\/td><\/tr><tr><td><strong>Synced to Postman cloud?<\/strong><\/td><td>Yes, visible to all teammates<\/td><td>No,&nbsp; stays on your local machine only<\/td><\/tr><tr><td><strong>Use Case<\/strong><\/td><td>Default\/placeholder values for sharing<\/td><td>Actual sensitive values (passwords, tokens)<\/td><\/tr><tr><td><strong>Best Practice<\/strong><\/td><td>Use non-sensitive placeholders<\/td><td>Store real secrets here; never commit to Git<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Important:<\/strong> Never put real API keys or passwords in <strong>Initial Value<\/strong>, they get synced and may be visible to other workspace members.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Authentication and Authorization in Postman,&nbsp; Interview Questions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>46. What authorization methods does Postman support?<\/strong><\/h3>\n\n\n\n<p>Postman supports <strong>8 built-in authorization methods:<\/strong><\/p>\n\n\n\n<ol>\n<li>No Auth<\/li>\n\n\n\n<li>API Key (Header or Query Parameter)<\/li>\n\n\n\n<li>Basic Auth (username + password, Base64 encoded)<\/li>\n\n\n\n<li>Bearer Token<\/li>\n\n\n\n<li>OAuth 1.0<\/li>\n\n\n\n<li>OAuth 2.0 (most commonly used for modern APIs)<\/li>\n\n\n\n<li>AWS Signature (for AWS API Gateway)<\/li>\n\n\n\n<li>Hawk Authentication \/ NTLM Authentication<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>47. How do you test API security\/authorization in Postman?<\/strong><\/h3>\n\n\n\n<p>In a real interview, you might be asked to verify that unauthorized users cannot access protected endpoints. Test this by:<\/p>\n\n\n\n<p>\/\/ Test that a request without a token returns 401<\/p>\n\n\n\n<p>pm.test(&#8220;Unauthenticated request returns 401&#8221;, function () {<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.response.to.have.status(401);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<p>\/\/ Test that an expired token returns 401 or 403<\/p>\n\n\n\n<p>pm.test(&#8220;Expired token is rejected&#8221;, function () {<\/p>\n\n\n\n<p>&nbsp;&nbsp;pm.expect(pm.response.code).to.be.oneOf([401, 403]);<\/p>\n\n\n\n<p>});<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Data-Driven Testing and CI\/CD Integration Questions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>48. What is the difference between running a collection in Postman GUI vs. Newman?<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><\/td><td><strong>Postman GUI (Collection Runner)<\/strong><\/td><td><strong>Newman CLI<\/strong><\/td><\/tr><tr><td><strong>Environment<\/strong><\/td><td>Desktop app<\/td><td>Terminal \/ CI server<\/td><\/tr><tr><td><strong>CI\/CD Integration<\/strong><\/td><td>Not possible directly<\/td><td>Yes,&nbsp; core use case<\/td><\/tr><tr><td><strong>Automation<\/strong><\/td><td>Manual trigger<\/td><td>Scriptable; fully automated<\/td><\/tr><tr><td><strong>Reporting<\/strong><\/td><td>In-app results<\/td><td>CLI, JUnit, HTML, JSON<\/td><\/tr><tr><td><strong>Headless<\/strong><\/td><td>No<\/td><td>Yes<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>49. How do you generate a test report from Newman?<\/strong><\/h3>\n\n\n\n<p># Install HTML reporter<\/p>\n\n\n\n<p>npm install -g newman-reporter-htmlextra<\/p>\n\n\n\n<p># Run and generate report<\/p>\n\n\n\n<p>newman run MyCollection.json \\<\/p>\n\n\n\n<p>&nbsp;&nbsp;-e staging.json \\<\/p>\n\n\n\n<p>&nbsp;&nbsp;&#8211;reporters htmlextra \\<\/p>\n\n\n\n<p>&nbsp;&nbsp;&#8211;reporter-htmlextra-export .\/reports\/api-test-report.html \\<\/p>\n\n\n\n<p>&nbsp;&nbsp;&#8211;reporter-htmlextra-title &#8220;GUVI API Test Report&#8221;<\/p>\n\n\n\n<p>The generated HTML file contains: total tests run, pass\/fail counts, response time graphs, request\/response details for each test.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>50. How do you handle sensitive data (passwords, API keys) securely in Postman?<\/strong><\/h3>\n\n\n\n<p>Best practices for handling sensitive data:<\/p>\n\n\n\n<ol>\n<li>Store secrets in <strong>Environment \u2192 Current Value<\/strong> only (never Initial Value)<\/li>\n\n\n\n<li>Use <strong>Postman Vault<\/strong> (paid feature) for encrypted secret storage<\/li>\n\n\n\n<li>In CI\/CD pipelines, inject secrets as <strong>environment variables<\/strong> and reference them in Newman via &#8211;env-var &#8220;API_KEY=$API_KEY&#8221;<\/li>\n\n\n\n<li>Never commit environment.json files with real secrets to Git,&nbsp; add them to .gitignore<\/li>\n\n\n\n<li>Use <strong>Postman Secret<\/strong> variable type (new in 2024) to mask sensitive values in logs<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Postman vs Swagger, Comparison Questions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>51. What is the difference between Postman and Swagger?<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Feature<\/strong><\/td><td><strong>Postman<\/strong><\/td><td><strong>Swagger (OpenAPI)<\/strong><\/td><\/tr><tr><td><strong>Primary Purpose<\/strong><\/td><td>API testing &amp; automation<\/td><td>API documentation &amp; design<\/td><\/tr><tr><td><strong>Testing<\/strong><\/td><td>Full test automation, scripting<\/td><td>Basic try-it-out only<\/td><\/tr><tr><td><strong>Documentation<\/strong><\/td><td>Auto-generated from collections<\/td><td>Core feature; rich spec format<\/td><\/tr><tr><td><strong>CI\/CD Integration<\/strong><\/td><td>Yes (via Newman)<\/td><td>Limited<\/td><\/tr><tr><td><strong>Collaboration<\/strong><\/td><td>Team workspaces, shared collections<\/td><td>Shared spec files<\/td><\/tr><tr><td><strong>Code Generation<\/strong><\/td><td>No<\/td><td>Yes (generate client SDKs)<\/td><\/tr><tr><td><strong>Best For<\/strong><\/td><td>QA engineers, testers<\/td><td>API designers, backend developers<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Key Insight:<\/strong> Postman and Swagger are <strong>complementary<\/strong>, not competing, many teams use Swagger to design the API spec and Postman to test against it. Postman can even import OpenAPI\/Swagger specs directly.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>52. Can Postman import Swagger\/OpenAPI specifications?<\/strong><\/h3>\n\n\n\n<p>Yes. Postman can import OpenAPI 2.0 (Swagger) and OpenAPI 3.0 specifications:<\/p>\n\n\n\n<ol>\n<li>Click <strong>Import<\/strong> in Postman<\/li>\n\n\n\n<li>Paste the Swagger JSON\/YAML URL or upload the file<\/li>\n\n\n\n<li>Postman automatically generates a collection with all endpoints from the spec<\/li>\n\n\n\n<li>You can then add test scripts, environments, and run the generated collection<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Postman Flows and AI Features,&nbsp; 2025\/2026 Questions<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>53. What is Postman Flows?<\/strong><\/h3>\n\n\n\n<p><strong>Postman Flows<\/strong> is a visual, no-code API workflow builder introduced in 2023. It allows you to chain API requests together graphically, connecting inputs and outputs of requests using a drag-and-drop interface,&nbsp; without writing JavaScript. It supports conditional logic, loops, and data transformation. Flows is used for orchestrating complex API workflows and building lightweight integrations without a separate scripting environment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>54. What are Postman&#8217;s AI-powered features in 2025\u20132026?<\/strong><\/h3>\n\n\n\n<p>Postman launched several AI features in 2025:<\/p>\n\n\n\n<ol>\n<li><strong>AI Request Generation:<\/strong> Describe what you want to test in plain English; Postman generates the request automatically<\/li>\n\n\n\n<li><strong>AI Test Script Suggestions:<\/strong> Postman analyzes your API response and suggests relevant test assertions<\/li>\n\n\n\n<li><strong>Postbot:<\/strong> An AI assistant built into Postman that can write test scripts, explain responses, and suggest improvements<\/li>\n\n\n\n<li><strong>AI Documentation Generation:<\/strong> Automatically generates API documentation from collections<\/li>\n<\/ol>\n\n\n\n<p><strong>Interview tip:<\/strong> Mentioning awareness of Postbot and AI-assisted testing shows that you stay current with tooling trends,&nbsp; a positive signal for senior QA roles.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>55. How do you test WebSocket APIs in Postman?<\/strong><\/h3>\n\n\n\n<p>Postman added <strong>WebSocket request support<\/strong> for testing real-time APIs:<\/p>\n\n\n\n<ol>\n<li>Click <strong>New<\/strong> \u2192 <strong>WebSocket Request<\/strong><\/li>\n\n\n\n<li>Enter the WebSocket server URL (e.g., wss:\/\/echo.websocket.org)<\/li>\n\n\n\n<li>Click <strong>Connect<\/strong> to establish the connection<\/li>\n\n\n\n<li>Send messages and view the real-time messages stream in the <strong>Messages<\/strong> panel<\/li>\n\n\n\n<li>Add <strong>events<\/strong> to listen for specific message types<\/li>\n<\/ol>\n\n\n\n<p>This is particularly useful for testing chat applications, live dashboards, and streaming data APIs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p>Mastering Postman is no longer optional for modern QA engineers, SDETs, and backend developers. From basic API requests and collections to advanced concepts like Newman, CI\/CD integration, OAuth authentication, schema validation, mock servers, and AI-assisted testing, Postman has evolved into a complete API development and automation ecosystem.<\/p>\n\n\n\n<p>These 55 Postman interview questions cover the exact concepts recruiters and hiring managers evaluate in 2026. Whether you&#8217;re preparing for your first QA interview or targeting senior automation and SDET roles, understanding not just the \u201cwhat\u201d but also the real-world use cases behind Postman features will give you a major advantage.<\/p>\n\n\n\n<p>The best way to strengthen your preparation is through hands-on practice. Build collections, automate workflows, integrate Newman into CI\/CD pipelines, test real-world APIs, and explore modern features like Postman Flows and Postbot AI. Practical experience is what ultimately separates interview-ready candidates from resume-only learners.<\/p>\n\n\n\n<p>As APIs continue to power modern applications, strong API testing skills will remain one of the most valuable assets in software testing and automation careers.<\/p>\n\n\n\n<p><strong>Reading about Postman interview questions is a start. Practicing them inside a real CI\/CD pipeline is what gets you hired. HCL GUVI\u00a0 <\/strong><a href=\"https:\/\/www.guvi.in\/zen-class\/devops-course\/?utm_source=blog&amp;utm_medium=hyperlink&amp;utm_campaign=postman-interview-questions\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>DevOps\u00a0 Cloud Engineering Course<\/strong><\/a> <strong>gives you exactly that,\u00a0 live projects, mentor support, NSDC certification, and 1000+ hiring partners.<\/strong><a href=\"https:\/\/www.guvi.in\/zen-class\/devops-course\/\"><strong>\u00a0<\/strong><\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Frequently Asked Questions&nbsp;<\/strong><\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-question-1779334790610\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>1. Is Postman free to use?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Yes. Postman offers a free tier that includes unlimited collections, environments, and API requests for individual developers and small teams. Paid plans add advanced collaboration, monitoring, governance, and enterprise-level features.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334805942\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>2. What programming language do Postman test scripts use?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Postman test scripts use JavaScript. Assertions are commonly written using the built-in ChaiJS assertion library through the pm.expect() API.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334813380\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>3. How many types of variables does Postman support?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Postman supports five main variable types:<br \/>Global Variables<br \/>Environment Variables<br \/>Collection Variables<br \/>Local Variables<br \/>Data Variables (from CSV or JSON files)<br \/>These variables help manage reusable data across requests and environments.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334823914\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>4. Can Postman test GraphQL APIs?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Yes. Postman has native GraphQL support, including schema auto-fetching, query editing, variables, and response testing.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334832327\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>5. What is Newman and how does it work?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Newman is Postman\u2019s command-line collection runner. It allows developers and testers to execute Postman collections directly from the terminal, mainly for automation and CI\/CD workflows.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334839855\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>6. How do you run a Postman collection from the command line?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>You can run a collection using Newman with the following command:<br \/>newman run collection.json -e environment.json &#8211;reporters cli,htmlextra<br \/>This executes the collection with a specific environment and generates test reports.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334878065\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>7. How do you share Postman collections with a team?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Teams can collaborate using a Postman Team Workspace, which automatically syncs collections, environments, and APIs. Alternatively, collections can be exported as JSON files and shared through Git repositories or file-sharing tools.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334885804\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>8. What certifications are available for Postman?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Postman offers certifications and learning programs through its learning platform, including:<br \/>Postman API Fundamentals Student Expert Certification<br \/>Postman API Professional Badge Program<br \/>These certifications help validate API testing and Postman skills.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334895214\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>9. What is the salary of a Postman API tester in India?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>In India, QA Engineers with Postman and API testing skills typically earn:<br \/>Entry Level: \u20b93.5\u20138 LPA<br \/>Mid Level: \u20b98\u201316 LPA<br \/>Senior\/Lead Level: \u20b916\u201328+ LPA<br \/>Salaries vary based on company, location, domain expertise, automation skills, and overall experience.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334905164\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>10. What are Postman Monitors and why are they useful?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Postman Monitors are scheduled automated runs of collections that continuously check API health, uptime, and performance. They help teams detect failures early and receive alerts when APIs behave unexpectedly in staging or production environments.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334912803\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>11. Can Postman replace Selenium?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>No. Postman and Selenium are designed for different purposes. Postman focuses on API testing, while Selenium is used for browser and UI automation testing. Most modern QA teams use both tools together for complete test coverage.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334920486\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>12. Is Postman enough for SDET roles?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Postman is an essential skill for SDET roles, but it is only one part of the required skill set. Companies usually expect knowledge of programming languages, automation frameworks, CI\/CD pipelines, databases, and test design concepts in addition to API testing.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334927036\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>13. Which is better: Postman or REST Assured?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>It depends on the use case. Postman is beginner-friendly and excellent for exploratory testing, collaboration, and API debugging. REST Assured is more suitable for code-based automation frameworks and scalable CI\/CD integration. Many teams use both tools together.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334934304\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>14. Can Postman automate APIs completely?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Yes. Postman can automate API workflows using collections, scripts, environments, monitors, and Newman. However, large enterprise automation projects may also use frameworks like PyTest, Karate, or REST Assured for advanced customization and maintainability.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334942306\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>15. Does Postman support microservices testing?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Yes. Postman is widely used for testing microservices architectures because it allows testers to validate individual services independently while also simulating end-to-end workflows across multiple APIs.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334950936\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>16. Can Postman test WebSockets and GraphQL together?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Yes. Modern versions of Postman support WebSocket APIs, GraphQL APIs, REST APIs, and event-driven testing within the same platform.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-question-1779334959141\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \"><strong>17. How long does it take to learn Postman?<\/strong><\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Most beginners can learn the basics within a few days. Mastering collections, scripting, automation, variables, monitors, and CI\/CD integration usually takes a few weeks of hands-on practice and real-world project experience.<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>Are you preparing for an API testing or backend role and wondering what kind of Postman questions might come up in your interview? You&#8217;re not alone.&nbsp; Postman has become the go-to tool for API development and testing, making it an essential skill for developers, QA engineers, and even product teams. From sending your first GET [&hellip;]<\/p>\n","protected":false},"author":66,"featured_media":101619,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[719,706],"tags":[],"views":"14418","authorinfo":{"name":"Salini Balasubramaniam","url":"https:\/\/www.guvi.in\/blog\/author\/salini\/"},"thumbnailURL":"https:\/\/www.guvi.in\/blog\/wp-content\/uploads\/2022\/08\/40-Savvy-Postman-Interview-Questions-You-Should-Know-300x116.png","_links":{"self":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/11799"}],"collection":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/users\/66"}],"replies":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/comments?post=11799"}],"version-history":[{"count":57,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/11799\/revisions"}],"predecessor-version":[{"id":112277,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/posts\/11799\/revisions\/112277"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/media\/101619"}],"wp:attachment":[{"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/media?parent=11799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/categories?post=11799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.guvi.in\/blog\/wp-json\/wp\/v2\/tags?post=11799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}