# formatjs/formatjs

The monorepo home to all of the FormatJS related libraries, most notably react-intl.

Repository: https://github.com/formatjs/formatjs
Canonical: https://ross.abutalabs.com/products/formatjs
Homepage: https://formatjs.github.io/
Language: TypeScript
License Family: other
Topics: javascript, react, i18n, formatjs, internationalization, globalization, localization, intl, translation, web, ui
Last push: 2026-08-26T18:59:03+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 4514, "days_push": 7, "days_rel": 10, "gap_med": 0, "n_releases_24m": 1130}
- flags: no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 14743, forks 1389 (observed 2026-08-28T04:11:07.607505+00:00)

## What it is
FormatJS is a monorepo of industry-standard JavaScript internationalization libraries built on ICU Message syntax and ECMA-402, most notably react-intl. It provides modular formatting of numbers, dates, and strings, plus framework integrations for React and Vue, running in browsers, Node.js, and Rust.

## Use cases
- internationalize a react app with translated messages
- format dates and numbers per user locale in javascript
- extract and compile icu message strings for translation
- polyfill intl datetimeformat in older browsers
- localize a vue application
- server-side render localized web pages

## When to choose
- you need standards-based i18n (ICU, ECMA-402) in a JavaScript web app
- you use React or Vue and want component/hook-based localization
- you need Intl polyfills for older browsers or Node versions

## When to avoid
- you need i18n for native mobile or non-JS backends without JS interop
- you want a full translation management platform rather than a formatting library

## Facets
- artifact type: library
- maturity: active
- function: internationalization, templating, ui-components, cli, parser
- domain: web-development, frontend, developer-tools
- platform: browser, cross-platform
- tags: i18n, react-intl, icu-message-format, translation, formatting, polyfills, vue, localization, nodejs, web-server

## Member repositories
- formatjs/formatjs (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:11:07.607505+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 2026-08-29T17:07:12.800262+00:00, confidence not recorded.
  - readme: https://github.com/formatjs/formatjs (fetched 2026-08-28T04:11:07.607505+00:00, sha 7913feac93f9)
  - homepage: https://formatjs.github.io/ (fetched 2026-08-29T08:05:40.445125+00:00, sha be43325a76e2)
- Data as of 2026-08-30T08:39:29.467469+00:00.