# react/react

The library for web and native user interfaces.

Repository: https://github.com/react/react
Canonical: https://ross.abutalabs.com/products/react
Homepage: https://react.dev
Language: JavaScript
License: MIT
License Family: permissive
Topics: javascript, react, frontend, declarative, ui, library
Last push: 2026-08-26T12:16:45+00:00

## Health v2 (maintenance only)
Score: 97/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 94, longevity 100
- inputs: {"age_days": 4849, "days_push": 7, "days_rel": 43, "gap_med": 0.0, "n_releases_24m": 31}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 247898, forks 51254 (observed 2026-08-28T04:03:10.675867+00:00)

## What it is
React is a JavaScript library for building declarative, component-based user interfaces for web and native applications. It lets developers compose encapsulated components that efficiently update and render when data changes, and can render on the server or power mobile apps via React Native.

## Use cases
- build interactive single-page web apps
- create reusable UI component libraries
- add interactivity to an existing HTML page
- render UI on the server with Node
- build cross-platform mobile apps with React Native
- manage complex application state with declarative views

## When to choose
- you want a mature, widely-adopted UI library with a huge ecosystem
- you prefer declarative, component-based UI development
- you need gradual adoption in an existing project
- you want one mental model across web and native

## When to avoid
- you need a full batteries-included framework with routing and data fetching out of the box
- your team prefers template-based or non-JSX paradigms
- you are building a tiny static site where plain HTML suffices

## Facets
- artifact type: library
- maturity: stable
- function: frontend-framework, ui-components, ssr, state-management
- domain: web-development, frontend, mobile-development, cross-platform
- platform: cross-platform, browser
- tags: declarative-ui, jsx, component-based, react-native, virtual-dom, web-server, nodejs

## Member repositories
- react/react (main) score 97

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:10.675867+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T16:10:20.036813+00:00, confidence not recorded.
  - readme: https://github.com/react/react (fetched 2026-08-28T04:03:10.675867+00:00, sha 8721600f065a)
  - homepage: https://react.dev (fetched 2026-08-28T17:21:21.877974+00:00, sha 49772cd8b11c)
  - site_page: https://react.dev/learn/installation (fetched 2026-08-28T17:21:21.886876+00:00, sha 4c3fe3be233e)
  - site_page: https://react.dev/community/docs-contributors (fetched 2026-08-28T17:21:21.889054+00:00, sha 30218b661890)
- Data as of 2026-08-30T08:39:29.467469+00:00.