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React

In-depth entry

by Meta Open Source / React team · Library · also known as React.js, ReactJS

Component-based JavaScript library for building user interfaces, created at Meta, with hooks, a declarative rendering model and server components

MIT licenseOpen sourceFreeLocalCloudSelf-hostedSelf-hostable
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Link verified Nov 2, 2026

Overview

React is an open-source JavaScript library for building user interfaces, created at Facebook in 2013 and developed by Meta's React team together with outside contributors under the MIT license. Interfaces are composed from components, functions that return a description of the UI (usually written in JSX) for a given state; React reconciles those descriptions against the actual DOM and updates only what changed. Hooks provide state, effects, context and memoization inside function components.

React itself is deliberately limited to rendering and state; routing, data fetching, styling and build tooling come from the surrounding ecosystem. Current practice pairs it with a framework such as Next.js for server rendering and routing, or with Vite for client-only applications, and with styling systems such as Tailwind CSS and component collections such as shadcn/ui. React Server Components, stabilized in React 19, let parts of a tree render on the server and ship no client JavaScript, and the React Compiler automates memoization that previously required manual hooks. React Native applies the same model to iOS and Android.

React's position makes it the largest front-end ecosystem by libraries, tutorials and hiring pool, which is a practical advantage for long-lived projects. Its drawbacks are the number of decisions left to the developer, the churn in recommended patterns (class components to hooks to server components), bundle sizes that depend heavily on the chosen stack, and the learning curve of server-versus-client boundaries in modern frameworks. Performance is adequate for most applications but requires attention to re-render behavior in complex trees.

Capabilities

  • Declarative component model with JSX
  • Hooks for state, effects and context
  • Virtual DOM reconciliation and concurrent rendering
  • React Server Components and streaming
  • React Compiler for automatic memoization
  • Shared model with React Native for mobile
  • Suspense for data loading and code splitting

Typical workflows

  1. Build a single-page application with Vite and a client router
  2. Render on the server with Next.js and hydrate on the client
  3. Assemble UI from Tailwind CSS and shadcn/ui components
  4. Share components between web and React Native

Strengths

  • Largest front-end ecosystem and community
  • Stable core API with long support
  • Server components reduce client JavaScript
  • MIT license

Limitations

  • Routing, data fetching and styling are left to the ecosystem
  • Pattern churn across major versions
  • Server/client component boundaries add complexity
  • Bundle size depends on the chosen stack

Prerequisites

  • Node.js or Bun with a bundler or framework

Who it is for

  • Front-end developers
  • Full-stack teams using Next.js
  • Mobile developers using React Native

Alternatives & comparison

Next.js is not a competitor but the most common framework built on React; comparing them is choosing between the library alone and a full-stack wrapper. Vite is the build tool most often used for React without a framework. SwiftUI is Apple's declarative UI framework and the closest analogue for native Apple applications, where React would require React Native.

  • Next.js

    React framework from Vercel for full-stack web applications with file-based routing, server components, server-side rendering, static generation and API route handlers

    Open sourceOpen source
  • shadcn/ui

    Collection of accessible React components built on Radix primitives and Tailwind CSS that are copied into a project's source rather than installed as a dependency

    Open sourceOpen source
  • SwiftUI

    Apple's declarative UI framework for building interfaces in Swift that run across iOS, iPadOS, macOS, watchOS, tvOS and visionOS

    ProprietaryFree
  • Vite

    Front-end build tool and development server that serves native ES modules during development and bundles for production, with a plugin API shared by many frameworks

    Open sourceOpen source
Compare React with its alternatives →

Sources & verification

Primary sources consulted for this record. Claims are tied to the fields each source supports; the automated link checker re-verifies every URL on a schedule.

  • License
    https://github.com/react/react/blob/main/LICENSE

    Supports: license_spdx

    checked Nov 1, 2026
  • Official documentation
    Learn React

    https://react.dev/learn

    Supports: capabilities, description

    checked Nov 1, 2026
  • Official site
    React

    https://react.dev/

    Supports: name, summary

    checked Nov 1, 2026
  • Repository
    react/react

    https://github.com/react/react

    Supports: repo_url, source_model

    Repository moved from facebook/react to react/react

    checked Nov 1, 2026
Confidence
High
Reviewed
Nov 1, 2026
Links
Verified · Nov 2, 2026

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Collection of accessible React components built on Radix primitives and Tailwind CSS that are copied into a project's source rather than installed as a dependency

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