React developer tools

Step 1: Install React Developer Tools

You can install React Developer Tools as a browser extension for Chrome or Firefox:

Chrome: React Developer Tools

or

Firefox: React Developer Tools

Step 2: Basic Usage

Once installed, you'll see a new tab in your browser's developer tools called "React". Here's a basic example of how to use it:

App.js

                import React, { useState } from 'react';
                import './App.css';

                const App = () => {
                  const [count, setCount] = useState(0);

                  const increment = () => {
                    setCount(count + 1);
                  };

                  return (
                    <div className="App">
                      <header className="App-header">
                        <p>Count: {count}</p>
                        <button onClick={increment}>Increment</button>
                      </header>
                    </div>
                  );
                };

                export default App;

App.css

          .App {
        text-align: center;
      }

      .App-header {
        background-color: #282c34;
        min-height: 100vh;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        font-size: calc(10px + 2vmin);
        color: white;
      }

      button {
        padding: 10px 20px;
        font-size: 16px;
        margin-top: 20px;
      }

Step 3: Inspecting Components

Data and Columns: Open your browser's developer tools (F12 or right-click and select "Inspect"), then navigate to the "React" tab.

Inspect the Component Tree: You'll see your React component tree. Expand the `App` component to see its state and props.

Edit State and Props: Click on the `App` component. In the right panel, you'll see the component's state and props. You can edit the state directly to see how your application reacts to changes.

Step 4: Using the Profiler

React Developer Tools also include a profiler to analyze the performance of your React application:

1. Navigate to the Profiler Tab: In the developer tools, click on the "Profiler" tab next to the "React" tab.

2. Record a Profile: Click on the "Record" button to start profiling, then interact with your application. Click "Stop" when done.

2. Analyze Performance: After stopping the recording, you'll see a flame graph showing where your application spends the most time. This helps you identify performance bottlenecks.

Additional Features

Component Search: Use the search bar at the top of the React Developer Tools to find specific components in your tree.

Highlight Updates: Click the "Highlight updates when components render" button to visually highlight components in the UI when they re-render.

Error Handling: If your application encounters errors, React Developer Tools will help you locate the component and line of code where the error occurred.