React is a JavaScript library for building user interfaces. It allows developers to create reusable UI components and manage the state of their applications in a efficient way. It follows a component-based architecture, where each component can maintain its own state and update the UI when the data changes. React also utilizes a virtual DOM, which optimizes updates by only changing the parts of the UI that need to be changed.

It was developed and is maintained by Facebook and is widely used in web development.

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Top contributors all time

Paul O’Shannessy1778
Brian Vaughn1736
Dan Abramov1583
Andrew Clark1352
Sophie Alpert1287
Sebastian Markbåge1170
Jim Sproch456
Dominic Gannaway436
Pete Hunt332
Cheng Lou222
Ben Newman140
Jeff Morrison130
Timothy Yung129
Josh Story128
Jan Kassens121
Luna Ruan117
Thomas Aylott115
Rick Hanlon101
Nicolas Gallagher92

Top contributors last 30 days

Jan Kassens8
Josh Story7
Ruslan Lesiutin5
Sebastian Markbåge5
Andrew Clark3
Christoph Pojer1
George Zahariev1
Jack Pope1
Karim Piyar Ali1
Mark Erikson1
Noah Lemen1
Rubén Norte1
Sourabh singh1
Tianyu Yao1


React · GitHub license npm version CircleCI Status PRs Welcome

React is a JavaScript library for building user interfaces.

  • Declarative: React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable, simpler to understand, and easier to debug.
  • Component-Based: Build encapsulated components that manage their own state, then compose them to make complex UIs. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep the state out of the DOM.
  • Learn Once, Write Anywhere: We don't make assumptions about the rest of your technology stack, so you can develop new features in React without rewriting existing code. React can also render on the server using Node and power mobile apps using React Native.

Learn how to use React in your project.


React has been designed for gradual adoption from the start, and you can use as little or as much React as you need:

You can use React as a <script> tag from a CDN, or as a react package on npm.


You can find the React documentation on the website.

Check out the Getting Started page for a quick overview.

The documentation is divided into several sections:

You can improve it by sending pull requests to this repository.


We have several examples on the website. Here is the first one to get you started:

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

function HelloMessage({ name }) {
  return <div>Hello {name}</div>;

const root = createRoot(document.getElementById('container'));
root.render(<HelloMessage name="Taylor" />);

This example will render "Hello Taylor" into a container on the page.

You'll notice that we used an HTML-like syntax; we call it JSX. JSX is not required to use React, but it makes code more readable, and writing it feels like writing HTML. If you're using React as a <script> tag, read this section on integrating JSX; otherwise, the recommended JavaScript toolchains handle it automatically.


The main purpose of this repository is to continue evolving React core, making it faster and easier to use. Development of React happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in improving React.

Code of Conduct

Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.

Contributing Guide

Read our contributing guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React.

Good First Issues

To help you get your feet wet and get you familiar with our contribution process, we have a list of good first issues that contain bugs that have a relatively limited scope. This is a great place to get started.


React is MIT licensed.