# andyearnshaw/Intl.js

Compatibility implementation of the ECMAScript Internationalization API (ECMA-402) for JavaScript -- UNMAINTAINED

Repository: https://github.com/andyearnshaw/Intl.js
Canonical: https://ross.abutalabs.com/products/intljs
Language: JavaScript
License: NOASSERTION
License Family: other
Archived: true
Last push: 2020-05-11T07:46:29+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4866, "days_push": 2305, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1691, forks 211 (observed 2026-08-28T04:05:22.627872+00:00)

## What it is
Intl.js is a compatibility polyfill implementing the ECMAScript Internationalization API (ECMA-402) for JavaScript environments that lack native support, such as legacy browsers and older Node.js runtimes. It provides locale-aware formatting and comparison methods per the specification, loading locale data as needed.

## Use cases
- add Intl API support to legacy browsers that lack it
- polyfill internationalization APIs in old Node.js versions
- load extra locale data for Node apps that only ship English by default
- serve the Intl polyfill conditionally via a CDN polyfill service
- format dates, numbers, and collate strings per ECMA-402 in unsupported environments

## When to choose
- you must support legacy browsers or old Node.js runtimes without native Intl
- you need a spec-compliant ECMA-402 fallback with per-locale data loading
- you maintain an older codebase already depending on this polyfill

## When to avoid
- you target modern browsers or Node.js 12+, which have native Intl support
- you need an actively maintained library with security updates
- you want full ICU coverage or newer ECMA-402 features like Intl.RelativeTimeFormat

## Facets
- artifact type: library
- maturity: abandoned
- function: internationalization, sdk
- domain: web-development, frontend, developer-tools
- platform: browser, cross-platform
- tags: polyfill, ecma-402, intl, i18n, legacy-browser-support, unmaintained, localization, nodejs

## Member repositories
- andyearnshaw/Intl.js (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:22.627872+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 2026-08-30T03:38:15.911336+00:00, confidence not recorded.
  - readme: https://github.com/andyearnshaw/Intl.js (fetched 2026-08-28T04:05:22.627872+00:00, sha 429419b9ef37)
- Data as of 2026-08-30T08:39:29.467469+00:00.