React https://react.dev/ · GitHub license https://img.shields.io/badge/license-MIT-blue.svg https://github.com/facebook/react/blob/main/LICENSE npm version https://img.shields.io/npm/v/react.svg?style=flat https://www.npmjs.com/package/react CircleCI Status https://circleci.com/gh/facebook/react.svg?style=shield https://circleci.com/gh/facebook/react PRs Welcome https://img.shields.io/badge/PRs-welcome-brightgreen.svg https://legacy.reactjs.org/docs/how-to-contribute.html#your-first-pull-request 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 https://nodejs.org/en and power mobile apps using React Native https://reactnative.dev/.
Learn how to use React in your project https://react.dev/learn.
Installation React has been designed for gradual adoption from the start, and you can use as little or as much React as you need:
Use Quick Start https://react.dev/learn to get a taste of React.
Add React to an Existing Project https://react.dev/learn/add-react-to-an-existing-project to use as little or as much React as you need.
Create a New React App https://react.dev/learn/start-a-new-react-project if you're looking for a powerful JavaScript toolchain.
Documentation You can find the React documentation on the website https://react.dev/.
Check out the Getting Started https://react.dev/learn page for a quick overview.
The documentation is divided into several sections:
Quick Start https://react.dev/learn
Tutorial https://react.dev/learn/tutorial-tic-tac-toe
Thinking in React https://react.dev/learn/thinking-in-react
Installation https://react.dev/learn/installation
Describing the UI https://react.dev/learn/describing-the-ui
Adding Interactivity https://react.dev/learn/adding-interactivity
Managing State https://react.dev/learn/managing-state
Advanced Guides https://react.dev/learn/escape-hatches
API Reference https://react.dev/reference/react
Where to Get Support https://react.dev/community
Contributing Guide https://legacy.reactjs.org/docs/how-to-contribute.html
You can improve it by sending pull requests to this repository https://github.com/reactjs/react.dev.
Examples We have several examples on the website https://react.dev/. 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 https://react.dev/learn#writing-markup-with-jsx. JSX is not required to use React, but it makes code more readable, and writing it feels like writing HTML.
Contributing 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 https://code.fb.com/codeofconduct Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text https://code.fb.com/codeofconduct so that you can understand what actions will and will not be tolerated.
Contributing Guide https://legacy.reactjs.org/docs/how-to-contribute.html Read our contributing guide https://legacy.reactjs.org/docs/how-to-contribute.html 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 https://github.com/facebook/react/labels/good%20first%20issue To help you get your feet wet and get you familiar with our contribution process, we have a list of good first issues https://github.com/facebook/react/labels/good%20first%20issue that contain bugs that have a relatively limited scope. This is a great place to get started.
License React is MIT licensed ./LICENSE.
