formatjs/formatjs

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

14743 stars · 1389 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

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

library · maturity active

internationalization templating ui-components cli parser web-development frontend developer-tools browser cross-platform i18n react-intl icu-message-format translation formatting polyfills vue localization nodejs web-server

Member repositories

For agents

markdown · JSON · MCP: product_card(name="formatjs/formatjs")