ReactDOMClient

These docs are old and won’t be updated. Go to react.dev for the new React docs.

These new documentation pages teach modern React:

react-dom: Client APIs

The react-dom/client package provides client-specific methods used for initializing an app on the client. Most of your components should not need to use this module.

import * as ReactDOM from 'react-dom/client';

If you use ES5 with npm, you can write:

var ReactDOM = require('react-dom/client');

Overview

The following methods can be used in client environments:

createRoot()
hydrateRoot()