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Using React Developer Tools

Using React Developer Tools

What is It?

React Developer Tools is a free browser extension for Chrome, Firefox, and Edge. It adds two tabs to your browser's developer tools.

The Components Tab

Shows your component tree instead of raw HTML. Selecting a component reveals:

  • Its current props
  • Its current state and Hook values
  • Which parent rendered it

You can edit props and state live to test different scenarios without changing code — useful for checking an empty state or an error message quickly.

The Profiler Tab

Records a session and shows which components rendered, how long each took, and why each one rendered. This is how you find performance problems rather than guessing at them.

Why is it Used?

console.log tells you what a value was at one moment. React DevTools shows you the whole tree's current state at once, which is far faster for questions like "why is this prop undefined?"

Install it from your browser's extension store, then open developer tools with F12 and look for the "Components" and "Profiler" tabs.

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ReactJS Tutorial

VA

Vishalini A

ReactJS Tutorial

MODULE 1 : ReactJS Fundamentals
lessonReactJS Tutorial: Learn React from Basics to Projects
lessonWhat is ReactJS? Uses, Components, and Example
lessonWhy Use ReactJS? Benefits, Uses, and Advantages
lessonReactJS Features: JSX, Components, Hooks & Virtual DOM
lessonReactJS vs Plain JavaScript
lessonReactJS vs Angular vs Vue
MODULE 2 : Setting Up Your React Development Environment
lessonPrerequisites Before You Start
lessonInstalling Node.js and npm
lessonCreating a React Application with Vite
lessonUnderstanding the React Project Structure
lessonRunning and Editing Your First React App
MODULE 3 : JSX and How React Renders
lessonJSX and How React Renders
lessonJSX Rules You Must Follow
lessonUsing Variables and Expressions in JSX
lessonStyling Components in React
lessonReact vs ReactDOM and the Virtual DOM
MODULE 4 : Components and Props
lessonWhat Are React Components?
lessonWhat is a Functional Component?
lessonProps Passing Data Into Components
lessonThe children Prop and Component Composition
lessonBuilding Reusable Components
MODULE 5 : State Events and Dynamic Rendering
lessonWhat is State? Introducing useState
lessonHandling Events in React
lessonUpdating State the Right Way
lessonConditional Rendering
lessonRendering Lists and Using Keys
lesson Props vs State
MODULE 6 : Forms and User Input
lessonControlled Components
lessonHandling Multiple Input Fields
lessonForm Validation Basics
lessonControlled vs Uncontrolled Components
MODULE 7 : React Hooks in Depth
lessonWhat Are Hooks? The Rules of Hooks
lessonuseEffect Running Side Effects
lessonuseRef DOM Access and Persistent Values
lessonuseContext and the Context API
lessonBuilding Custom Hooks
MODULE 8 : Working with APIs
lessonFetching Data with fetch()
lessonWhat is Axios?
lessonHandling Loading and Error States
lessonReact POST Requests
MODULE 9 : Routing with React Router
lessonWhy Routing is Needed in React
lessonSetting Up React Router
lessonNavigation with Link and NavLink
lessonDynamic Routes and URL Parameters
lessonNested Routes and 404 Pages
MODULE 10 : Performance Debugging and Best Practices
lessonUsing React Developer Tools
lessonUnderstanding Re-Renders memo, useMemo, useCallback
lessonLazy Loading and Code Splitting
lesson Error Boundaries and Error Handling

Learn via Video Course

React.js for Beginners: Build Modern Web Applications with React Logo

React.js for Beginners: Build Modern Web Applications with React

6 hrs

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ReactJS Tutorial

    MODULE 1 : ReactJS Fundamentals
    lessonReactJS Tutorial: Learn React from Basics to Projects
    lessonWhat is ReactJS? Uses, Components, and Example
    lessonWhy Use ReactJS? Benefits, Uses, and Advantages
    lessonReactJS Features: JSX, Components, Hooks & Virtual DOM
    lessonReactJS vs Plain JavaScript
    lessonReactJS vs Angular vs Vue
    MODULE 2 : Setting Up Your React Development Environment
    lessonPrerequisites Before You Start
    lessonInstalling Node.js and npm
    lessonCreating a React Application with Vite
    lessonUnderstanding the React Project Structure
    lessonRunning and Editing Your First React App
    MODULE 3 : JSX and How React Renders
    lessonJSX and How React Renders
    lessonJSX Rules You Must Follow
    lessonUsing Variables and Expressions in JSX
    lessonStyling Components in React
    lessonReact vs ReactDOM and the Virtual DOM
    MODULE 4 : Components and Props
    lessonWhat Are React Components?
    lessonWhat is a Functional Component?
    lessonProps Passing Data Into Components
    lessonThe children Prop and Component Composition
    lessonBuilding Reusable Components
    MODULE 5 : State Events and Dynamic Rendering
    lessonWhat is State? Introducing useState
    lessonHandling Events in React
    lessonUpdating State the Right Way
    lessonConditional Rendering
    lessonRendering Lists and Using Keys
    lesson Props vs State
    MODULE 6 : Forms and User Input
    lessonControlled Components
    lessonHandling Multiple Input Fields
    lessonForm Validation Basics
    lessonControlled vs Uncontrolled Components
    MODULE 7 : React Hooks in Depth
    lessonWhat Are Hooks? The Rules of Hooks
    lessonuseEffect Running Side Effects
    lessonuseRef DOM Access and Persistent Values
    lessonuseContext and the Context API
    lessonBuilding Custom Hooks
    MODULE 8 : Working with APIs
    lessonFetching Data with fetch()
    lessonWhat is Axios?
    lessonHandling Loading and Error States
    lessonReact POST Requests
    MODULE 9 : Routing with React Router
    lessonWhy Routing is Needed in React
    lessonSetting Up React Router
    lessonNavigation with Link and NavLink
    lessonDynamic Routes and URL Parameters
    lessonNested Routes and 404 Pages
    MODULE 10 : Performance Debugging and Best Practices
    lessonUsing React Developer Tools
    lessonUnderstanding Re-Renders memo, useMemo, useCallback
    lessonLazy Loading and Code Splitting
    lesson Error Boundaries and Error Handling

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    HCL GUVI (Grab Your Vernacular Imprint) Geek Network Private Limited is a leading online learning and skills development company, incubated by IIT Madras and IIM Ahmedabad.

    Established in 2014 and acquired by the HCL Group in 2022, HCL GUVI is dedicated to providing effective and high-quality learning and skilling programs that transcend language barriers in technology education. HCL GUVI today is trusted by over 4.8 million users, 20 languages and 2500+ corporate partners.

    app storeplay store
    Refer & Earn

    HCL GUVI (Grab Your Vernacular Imprint) Geek Network Private Limited is a leading online learning and skills development company, incubated by IIT Madras and IIM Ahmedabad.

    Established in 2014 and acquired by the HCL Group in 2022, HCL GUVI is dedicated to providing effective and high-quality learning and skilling programs that transcend language barriers in technology education. HCL GUVI today is trusted by over 4.8 million users, 20 languages and 2500+ corporate partners.

    app storeplay storeRefer & Earn
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    HCL GUVI Geek Network Pvt. Ltd.

    Terms and ConditionsPrivacy Policy

    HCL GUVI Geek Network Pvt. Ltd.