Skip to content
A declarative, efficient, and flexible JavaScript library for building user interfaces.
JavaScript HTML C++ TypeScript CoffeeScript CSS Other
Branch: master
Clone or download
Type Name Latest commit message Commit time
Failed to load latest commit information.
.circleci [CI] Disable coverage (#16380) Aug 13, 2019
.github Reword issue template Jan 3, 2018
fixtures [Partial Hydration] Attempt hydration at a higher pri first if props/… Aug 14, 2019
packages Added DevTools 4.0.4 CHANGELOG entry Aug 18, 2019
scripts Added better error reporting for print-warnings errors (#16394) Aug 14, 2019
.editorconfig Add insert_final_newline to editorconfig Sep 3, 2015
.eslintignore Use Yarn Workspaces (#11252) Oct 18, 2017
.eslintrc.js Revert "[Scheduler] Profiling features (#16145)" (#16392) Aug 14, 2019
.gitattributes .gitattributes to ensure LF line endings when we should Jan 18, 2014
.gitignore Parallelizes the build script across multiple processes (#15716) May 29, 2019
.mailmap Update .mailmap Sep 6, 2017
.nvmrc Add new docs website (#10896) Sep 28, 2017
.prettierrc.js Add `use strict` to .prettierrc.js (#13787) Oct 20, 2018
.watchmanconfig .watchmanconfig must be valid json (#16118) Jul 12, 2019
AUTHORS Update authors for v16 (#10861) Sep 27, 2017 Changelog for 16.9 (#16254) Aug 8, 2019 Updated url to Code of Conduct page (#13126) Jun 29, 2018 [Gatsby] "" -> "" ( Sep 30, 2017
LICENSE Drop the year from Facebook copyright headers and the LICENSE file. (#… Sep 7, 2018 Remove coverage badge from README (#15216) Mar 26, 2019
appveyor.yml add nodejs 10 to windows test (#13241) Aug 2, 2018
babel.config.js Babel 7 (#16297) Aug 9, 2019
dangerfile.js Update name of CI job in sizebot (#15767) May 29, 2019
netlify.toml add netlify toml file (#12350) May 20, 2018
package.json chore: add eslint-plugin-jest's valid-expect rule (#16332) Aug 14, 2019
yarn.lock chore: make tests compatible with Jest 24 (#15779) Aug 14, 2019

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 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 own 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:

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

  <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 to evolve 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 which have a relatively limited scope. This is a great place to get started.


React is MIT licensed.

You can’t perform that action at this time.