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⚛️ Fast 3kB React alternative with the same modern API. Components & Virtual DOM.
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.github Move Code of Conduct into .github dir Jul 10, 2019
compat Add tests highlighting issues of Suspense (#2229) Jan 5, 2020
config Apply prettier formatting to js files Oct 29, 2019
debug Remove process.env check which broke borwsers (#2257) Jan 17, 2020
demo Add babel plugin for jsx source Dec 11, 2019
hooks avoid stale closure in error boundary (#2225) Jan 3, 2020
src Include support for customised built-in elements (#2266) Jan 22, 2020
test-utils Rewrite teardown tests to not rely on internals Nov 15, 2019
test Add test coverage for createElement (#2273) Jan 22, 2020
.editorconfig Make all json files use 2-space Oct 31, 2019
.gitignore adding the package-lock.json Jan 16, 2020
.travis.yml add npm ci to speed up travis (#2255) Jan 16, 2020 Add back CoC from Preact 8 branch (#1897) Aug 27, 2019 Add info for first time contributors (#2265) Jan 21, 2020
LICENSE Update license year Jan 1, 2018 More readme updates (#2235) Jan 7, 2020
babel.config.js Inline babel config to allow file based plugins Dec 13, 2019
jsconfig.json Add jsconfig.json to improve VSCode intellisense Nov 3, 2019
karma.conf.js Add workaround for non-ES5 sinon esm bundle (#2188) Dec 16, 2019
mangle.json Replace "__p" to "__" in mangle.json (#2044) Nov 2, 2019
package-lock.json Prevent postinstall from running on installation (#2271) Jan 22, 2020
package.json Prevent postinstall from running on installation (#2271) Jan 22, 2020
sizereport.config.js (chore) - Update links (#1649) May 23, 2019


Fast 3kB alternative to React with the same modern API.

All the power of Virtual DOM components, without the overhead:

  • Familiar React API & patterns: ES6 Class, hooks, and Functional Components
  • Extensive React compatibility via a simple preact/compat alias
  • Everything you need: JSX, VDOM, DevTools, HMR, SSR.
  • Highly optimized diff algorithm and seamless hydration from Server Side Rendering
  • Supports all modern browsers and IE11+
  • Transparent asynchronous rendering with a pluggable scheduler
  • Instant production-grade app setup with Preact CLI

💁 More information at the Preact Website ➞

npm Preact Slack Community OpenCollective Backers OpenCollective Sponsors

travis coveralls gzip size brotli size

You can find some awesome libraries in the awesome-preact list 😎

Getting Started

💁 Note: You don't need ES2015 to use Preact... but give it a try!

The easiest way to get started with Preact is to install Preact CLI. This simple command-line tool wraps up the best possible tooling for you, and even keeps things like Webpack and Babel up-to-date as they change. Best of all, it's easy to understand! Start a project or compile for production in a single command (preact build), with no configuration needed and best practices baked in! 🙌

Tutorial: Building UI with Preact

With Preact, you create user interfaces by assembling trees of components and elements. Components are functions or classes that return a description of what their tree should output. These descriptions are typically written in JSX (shown underneath), or HTM which leverages standard JavaScript Tagged Templates. Both syntaxes can express trees of elements with "props" (similar to HTML attributes) and children.

To get started using Preact, first look at the render() function. This function accepts a tree description and creates the structure described. Next, it appends this structure to a parent DOM element provided as the second argument. Future calls to render() will reuse the existing tree and update it in-place in the DOM. Internally, render() will calculate the difference from previous outputted structures in an attempt to perform as few DOM operations as possible.

import { h, render } from 'preact';
// Tells babel to use h for JSX. It's better to configure this globally.
// See
// In tsconfig you can specify this with the jsxFactory
/** @jsx h */

// create our tree and append it to document.body:
render(<main><h1>Hello</h1></main>, document.body);

// update the tree in-place:
render(<main><h1>Hello World!</h1></main>, document.body);
// ^ this second invocation of render(...) will use a single DOM call to update the text of the <h1>

Hooray! render() has taken our structure and output a User Interface! This approach demonstrates a simple case, but would be difficult to use as an application grows in complexity. Each change would be forced to calculate the difference between the current and updated stucture for the entire application. Components can help here – by dividing the User Interface into nested Components each can calculate their difference from their mounted point. Here's an example:

import { render, h } from 'preact';
import { useState } from 'preact/hooks';

/** @jsx h */

const App = () => {
	const [input, setInput] = useState('');

	return (
			<p>Do you agree to the statement: "Preact is awesome"?</p>
			<input value={input} onChange={e => setInput(} />

render(<App />, document.body);


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