messageformat/messageformat

Health v2 · maintenance only

Adoption not part of the score

1767 stars · 160 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A JavaScript monorepo implementing both Unicode MessageFormat 2 and ICU MessageFormat 1, including parsers, runtimes, compilers, and an Intl.MessageFormat polyfill. It supports pluralization, gender, and other locale-aware message formatting across all CLDR languages, with tooling for CLI, Webpack, Rollup, React, and format conversion (Fluent, XLIFF, MF1).

Use cases

• format localized messages with pluralization and gender rules in javascript
• polyfill intl.messageformat in browsers
• parse and format unicode messageformat 2 strings
• compile icu messageformat strings into javascript functions
• convert fluent or xliff files to messageformat
• load message translations from json yaml or properties files in webpack
• use localized messages in react components

When to choose

• you need standards-compliant ICU or Unicode MessageFormat handling in JS/TS
• you need pluralization and gender-aware message formatting across many languages
• you want build-time compilation of message files via webpack or rollup
• you need an Intl.MessageFormat polyfill or MF2 tooling like parsers and validators

When to avoid

• you need full application i18n frameworks with routing, extraction, and translation management
• your project is not JavaScript/TypeScript based
• you only need simple key-value string lookups without plural/gender logic

Facets

library · maturity active

internationalization parser templating sdk web-development frontend browser cli icu-messageformat unicode-messageformat-2 i18n l10n pluralization intl-messageformat monorepo react-bindings webpack-loader rollup-plugin internationalization localization nodejs javascript typescript

Member repositories

For agents

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