A declarative, efficient, and flexible JavaScript library for building user interfaces.
JavaScript C++ HTML TypeScript CoffeeScript Shell Other
Clone or download
mridgway and gaearon Fixes children when using dangerouslySetInnerHtml in a selected <opti…
…on> (#13078)

* Fixes children when using dangerouslySetInnerHtml in a selected <option>

This fixes an inadvertent cast of undefined children to an empty string when creating an option tag that will be selected:

  <select defaultValue="test">
    <option value='test' dangerouslySetInnerHTML={{ __html: '&rlm; test'}} />

This causes an invariant error because both children and dangerouslySetInnerHTML are set.

* PR fix and new ReactDOMServerIntegrationForms test

* Account for null case

* Combine test cases into single test

* Add tests for failure cases

* Fix lint
Latest commit da5c87b Jun 22, 2018
Failed to load latest commit information.
.circleci Use --frozen-lockfile for Yarn in CI build (#12914) May 28, 2018
.github Reword issue template Jan 3, 2018
fixtures Adding movementX and movementY to synthenticMouseEvent fixes #6723 (#… Jun 15, 2018
packages Fixes children when using dangerouslySetInnerHtml in a selected <opti… Jun 21, 2018
scripts Remove transitive dependency on fbjs (#13075) Jun 19, 2018
.babelrc Remove ES3-specific transforms (#12716) Apr 30, 2018
.editorconfig Add insert_final_newline to editorconfig Sep 3, 2015
.eslintignore Use Yarn Workspaces (#11252) Oct 18, 2017
.eslintrc.js Added production profiling bundle type (#12886) Jun 11, 2018
.flowcoverage flow-coverage-report (#11545) Jan 9, 2018
.gitattributes .gitattributes to ensure LF line endings when we should Jan 18, 2014
.gitignore Run Flow for each renderer separately (#12846) May 18, 2018
.mailmap Update .mailmap Sep 6, 2017
.nvmrc Add new docs website (#10896) Sep 28, 2017
.prettierrc.js Use Prettier Config API (#11980) Jan 7, 2018
.watchmanconfig Added a .watchmanconfig file (#11581) Nov 17, 2017
AUTHORS Update authors for v16 (#10861) Sep 27, 2017
CHANGELOG.md Update changelog for 16.4.1 Jun 13, 2018
CODE_OF_CONDUCT.md Add `CODE_OF_CONDUCT.md` (#11512) Nov 10, 2017
CONTRIBUTING.md [Gatsby] "https://facebook.github.io/react/" -> "https://reactjs.org/" ( Sep 30, 2017
LICENSE Change license and remove references to PATENTS Sep 26, 2017
README.md Removed documentation badge from readme.md (#12424) Mar 22, 2018
appveyor.yml use --frozen-lockfile in AppVeyor (#12950) Jun 6, 2018
dangerfile.js Minor fix params description for addPercent function (#12669) May 8, 2018
netlify.toml add netlify toml file (#12350) May 20, 2018
package.json Remove transitive dependency on fbjs (#13075) Jun 19, 2018
yarn.lock Remove transitive dependency on fbjs (#13075) Jun 19, 2018


React · GitHub license npm version Coverage Status 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.


You can find the React documentation on the website.
It 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:

class HelloMessage extends React.Component {
  render() {
    return <div>Hello {this.props.name}</div>;

  <HelloMessage name="John" />,

This example will render "Hello John" 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. We recommend using Babel with a React preset to convert JSX into native JavaScript for browsers to digest.


React is available as the react package on npm. It is also available on a CDN.

React is flexible and can be used in a variety of projects. You can create new apps with it, but you can also gradually introduce it into an existing codebase without doing a rewrite.

The recommended way to install React depends on your project. Here you can find short guides for the most common scenarios:


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.