React Scan is a powerful tool designed to detect and resolve performance issues in your React applications effortlessly. Unlike traditional methods such as the <Profiler />, Why Did You Render?, and React Devtools, which often require extensive code changes and can overwhelm developers with noisy data, React Scan offers a streamlined solution that identifies and highlights the components causing unnecessary re-renders with just a simple integration.

Key Features:

• Automatic Detection: React Scan automatically scans your app for performance bottlenecks, providing clear visual cues about which components need optimization.
• Minimal Setup: Implement React Scan easily by adding a script tag or installing it via npm. Its JavaScript-friendly design allows for immediate deployment.
• User-Friendly: Get insights without needing to change much of your existing codebase. React Scan provides an intuitive interface to help you pinpoint render issues effectively.

Getting Started

You can quickly integrate React Scan into your application with minimal effort. Simply add the following code snippet:

<!-- Add this script tag within your HTML before other scripts -->
<script src="https://unpkg.com/react-scan/dist/auto.global.js"></script>

OR, if you prefer using npm:

npm install react-scan

Once included in your app, start scanning to log render information and optimize your components:

import { scan } from 'react-scan'; // import this BEFORE react
import React from 'react';

scan({
  enabled: true,
  log: true, // logs render info to console
  clearLog: false, // retains the console log between groups of renders
});

For a more guided approach, utilize the withScan API:

import { withScan } from 'react-scan';

const ExpensiveComponent = withScan(
  (props) => {
    // Component implementation
  },
  { log: true },
);

Why Choose React Scan?

React optimization can be challenging due to how React compares component props by reference, making it easy for developers to inadvertently trigger unnecessary re-renders. This is especially prevalent with frequently recreated props like callback functions or object values. React Scan simplifies the optimization process by clearly identifying which components are the culprits behind performance issues, allowing developers to focus on what truly matters.

For those interested in automating the fix for these issues, explore Million Lint!

Join the Community

Engage with the React Scan community by visiting our Discord to share your experiences and learn from others. If you encounter any bugs or want to contribute, our issue tracker and Contributing Guide are the perfect places to start.

Ready to elevate your React app's performance? Try it out now! →

Transform not just how your React app performs but also how you develop it with React Scan!