Upgrade React

Upgrading to React 18 is a significant step for any React developer looking to harness the latest features and improvements in this popular JavaScript library. In this guide, we’ll walk you through the process of upgrading to React 18, including installation and the utilization of the new root API, with practical examples to ensure you’re getting the most out of these updates.

Upgrade to React 18

React 18 introduces a host of new features and performance improvements that can enhance your application’s responsiveness and user experience. Before you begin the upgrade, it’s crucial to understand the changes and how they can benefit your project.

Why Upgrade?

  • Concurrent Rendering: React 18 offers a new concurrent rendering feature, enabling your app to prepare multiple versions of the UI at the same time. This means smoother updates and a more responsive feel.
  • Automatic Batching: Updates are now automatically batched, resulting in fewer render phases and better performance.
  • New APIs: React 18 introduces several new APIs, including startTransition, which helps in prioritizing different types of updates.

Step 1: Install React 18

To upgrade to React 18, you’ll first need to update your project’s dependencies. This can be done using npm or yarn. Here’s how you can do it using npm:

npm install react@18 react-dom@18

Step 2: Use the New Root API

With React 18, there’s a significant change in how you render your React app. The new root API provides a more flexible way to initialize your app’s rendering. Here’s an example of how to implement it:

import { createRoot } from 'react-dom/client';
import App from './App';

// Assuming your HTML file has a div with id 'root'
const container = document.getElementById('root');
const root = createRoot(container); // create a root
root.render(<App />);

This new method replaces the older ReactDOM.render and is a crucial step in taking advantage of React 18’s concurrent features.

By following these steps and understanding the underlying concepts, you’re well on your way to leveraging the full power of React 18. Remember, upgrading to a new version not only brings in new features but also keeps your application secure and efficient. As you embark on this journey, keep experimenting with the new capabilities, and you’ll find your React applications reaching new heights of performance and user experience.


Upgrading to React 18 marks a significant milestone in your development journey. By embracing these new features and APIs, you’re not only enhancing your application but also future-proofing your skills as a React developer. Keep learning, keep building, and watch as your React applications transform with these advanced capabilities.