React

Stable

React lets you build user interfaces out of individual pieces called components. It powers everything from small widgets to entire web and native applications.

Latest Version: 19.2
Release Date: April 14, 2026
Maintainer: Meta (React core team) & open source contributors
Type: JavaScript Library

Quick Links

Official Website Documentation GitHub Repository

Installation

npm install react react-dom

What's New in 19.2

New Features

Stable React Compiler adoption path via `babel-plugin-react-compiler`
Improved `<Activity>` API for pre-rendering hidden UI

Improvements

Better hydration mismatch error messages with component stack traces
Refined Server Actions error handling

Performance

Reduced re-renders for context consumers that don't use the changed value
Smaller client runtime for apps using Server Components

Bug Fixes

Fixed a `useDeferredValue` initial-value edge case
Corrected ref cleanup ordering on unmount

Breaking Changes

Migration Guide

PropTypes and defaultProps removed from function components
Both were deprecated since React 18.3 and are no longer supported on function components - use TypeScript or a runtime validation library instead.
String refs fully removed
Use callback refs or `useRef` - the legacy string ref API (`ref="myRef"`) no longer works anywhere in the tree.

React 19 introduced Actions, the `use()` hook, and a built-in Compiler that automatically memoizes components - reducing the amount of manual `useMemo`/`useCallback` most apps needed. This release line continues refining Server Components support and hydration diagnostics.