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React

v17.0.2 Languages GitHub

Getting Started

This page is an overview of the React documentation and related resources. React is a JavaScript library for building user interfaces. Learn what React is all about on our homepageorin the tutorial.

●Try React ●Learn React ●Staying Informed ●Versioned Documentation ●Something Missing?

Try React

React has been designed from the start for gradual adoption, and you can use as little or as much React as you need. Whether you want to get a taste of React, add some interactivity to a simple HTML page, or start a complex React-powered app, the links in this section will help you get started.

Online Playgrounds

If you’re interested in playing around with React, you can use an online code playground. Try a Hello World template on CodePen, CodeSandbox, or Stackblitz. If you prefer to use your own text editor, you can also download this HTML file, edit it, and open it from the local filesystem in your browser. It does a slow runtime code transformation, so we’d only recommend using this for simple demos.

Add React to a Website

You can add React to an HTML page in one minute. You can then either gradually expand its presence, or keep it contained to a few dynamic widgets.

Create a New React App

When starting a React project, a simple HTML page with script tags might still be the best option. It only takes a minute to set up! As your application grows, you might want to consider a more integrated setup. There are several JavaScript toolchains we recommend for larger applications. Each of them can work with little to no configuration and lets you take full advantage of the rich React ecosystem. Learn how.

Learn React

People come to React from different backgrounds and with different learning styles. Whether you prefer a more theoretical or a practical approach, we hope you’ll find this section helpful. ●If you prefer to learn by doing, start with our practical tutorial. ●If you prefer to learn concepts step by step, start with our guide to main concepts. Like any unfamiliar technology, React does have a learning curve. With practice and some patience, you will get the hang of it.

First Examples

The React homepage contains a few small React examples with a live editor. Even if you don’t know anything about React yet, try changing their code and see how it affects the result.

React for Beginners

If you feel that the React documentation goes at a faster pace than you’re comfortable with, check out this overview of React by Tania Rascia. It introduces the most important React concepts in a detailed, beginner-friendly way. Once you’re done, give the documentation another try!

React for Designers

If you’re coming from a design background, these resources are a great place to get started.

JavaScript Resources

The React documentation assumes some familiarity with programming in the JavaScript language. You don’t have to be an expert, but it’s harder to learn both React and JavaScript at the same time. We recommend going through this JavaScript overview to check your knowledge level. It will take you between 30 minutes and an hour but you will feel more confident learning React. Tip Whenever you get confused by something in JavaScript, MDN and javascript.info are great websites to check. There are also community support forums where you can ask for help.

Practical Tutorial

If you prefer to learn by doing, check out our practical tutorial. In this tutorial, we build a tic-tac-toe game in React. You might be tempted to skip it because you’re not into building games — but give it a chance. The techniques you’ll learn in the tutorial are fundamental to building any React apps, and mastering it will give you a much deeper understanding.

Step-by-Step Guide

If you prefer to learn concepts step by step, our guide to main concepts is the best place to start. Every next chapter in it builds on the knowledge introduced in the previous chapters so you won’t miss anything as you go along.

Thinking in React

Many React users credit reading Thinking in React as the moment React finally “clicked” for them. It’s probably the oldest React walkthrough but it’s still just as relevant.

Recommended Courses

Sometimes people find third-party books and video courses more helpful than the official documentation. We maintain a list of commonly recommended resources, some of which are free.

Advanced Concepts

Once you’re comfortable with the main concepts and played with React a little bit, you might be interested in more advanced topics. This section will introduce you to the powerful, but less commonly used React features like context and refs.

API Reference

This documentation section is useful when you want to learn more details about a particular React API. For example, React.Component API reference can provide you with details on how setState() works, and what different lifecycle methods are useful for.

Glossary and FAQ

The glossary contains an overview of the most common terms you’ll see in the React documentation. There is also a FAQ section dedicated to short questions and answers about common topics, including making AJAX requests, component state, and file structure.

Staying Informed

The React blog is the official source for the updates from the React team. Anything important, including release notes or deprecation notices, will be posted there first. You can also follow the @reactjs account on Twitter, but you won’t miss anything essential if you only read the blog. Not every React release deserves its own blog post, but you can find a detailed changelog for every release in the CHANGELOG.md file in the React repository, as well as on the Releases page.

Versioned Documentation

This documentation always reflects the latest stable version of React. Since React 16, you can find older versions of the documentation on a separate page. Note that documentation for past versions is snapshotted at the time of the release, and isn’t being continuously updated.

Something Missing?

If something is missing in the documentation or if you found some part confusing, please file an issue for the documentation repository with your suggestions for improvement, or tweet at the @reactjs account. We love hearing from you! Is this page useful?Edit this page Installation ●Getting Started ●Add React to a Website ●Create a New React App ●CDN Links ●Release Channels Main Concepts ●1. Hello World ●2. Introducing JSX ●3. Rendering Elements ●4. Components and Props ●5. State and Lifecycle ●6. Handling Events ●7. Conditional Rendering ●8. Lists and Keys ●9. Forms ●10. Lifting State Up ●11. Composition vs Inheritance ●12. Thinking In React Advanced Guides ●Accessibility ●Code-Splitting ●Context ●Error Boundaries ●Forwarding Refs ●Fragments ●Higher-Order Components ●Integrating with Other Libraries ●JSX In Depth ●Optimizing Performance ●Portals ●Profiler ●React Without ES6 ●React Without JSX ●Reconciliation ●Refs and the DOM ●Render Props ●Static Type Checking ●Strict Mode ●Typechecking With PropTypes ●Uncontrolled Components ●Web Components API Reference ●React ●React.Component ●ReactDOM ●ReactDOMServer ●DOM Elements ●SyntheticEvent ●Test Utilities ●Test Renderer ●JS Environment Requirements ●Glossary Hooks ●1. Introducing Hooks ●2. Hooks at a Glance ●3. Using the State Hook ●4. Using the Effect Hook ●5. Rules of Hooks ●6. Building Your Own Hooks ●7. Hooks API Reference ●8. Hooks FAQ Testing ●Testing Overview ●Testing Recipes ●Testing Environments Contributing ●How to Contribute ●Codebase Overview ●Implementation Notes ●Design Principles FAQ ●AJAX and APIs ●Babel, JSX, and Build Steps ●Passing Functions to Components ●Component State ●Styling and CSS ●File Structure ●Versioning Policy ●Virtual DOM and Internals Next article Add React to a Website Docs Installation Main Concepts Advanced Guides API Reference Hooks Testing Contributing FAQ Channels GitHub Stack Overflow Discussion Forums Reactiflux Chat DEV Community Facebook Twitter Community Code of Conduct Community Resources More Tutorial Blog Acknowledgements React Native Privacy Terms