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React is a JavaScript library for creating user interfaces.

The react package contains only the functionality necessary to define React components. It is typically used together with a React renderer like react-dom for the web, or react-native for the native environments.

Note: by default, React will be in development mode. The development version includes extra warnings about common mistakes, whereas the production version includes extra performance optimizations and strips all error messages. Don’t forget to use the production build when deploying your application.

Example Usage

var React = require('react');


This package serves as the entry point to the DOM and server renderers for React. It is intended to be paired with the generic React package, which is shipped as react to npm.


npm install react react-dom


In the browser

var React = require('react');
var ReactDOM = require('react-dom');

class MyComponent extends React.Component {
  render() {
    return <div>Hello World</div>;

ReactDOM.render(<MyComponent />, node);