# audiocogs/aurora.js

JavaScript audio decoding framework

Repository: https://github.com/audiocogs/aurora.js
Canonical: https://ross.abutalabs.com/products/aurorajs
Homepage: http://audiocogs.org/codecs
Language: CoffeeScript
License Family: other
Last push: 2019-04-17T12:19:58+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 5194, "days_push": 2695, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- 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 1272, forks 144 (observed 2026-08-28T04:04:12.270521+00:00)

## What it is
Aurora.js is a JavaScript framework that simplifies writing audio decoders, handling binary data, the demuxer-to-decoder pipeline, and abstracting browser audio APIs for playback. It ships with LPCM, uLaw, and aLaw support and is extensible via codec plugins like MP3.js, FLAC.js, ALAC.js, and AAC.js.

## Use cases
- decode and play mp3 files in the browser with javascript
- play flac audio in browsers without native support
- build a custom audio decoder in javascript
- decode audio files in node.js
- play apple lossless alac files on the web
- abstract browser audio apis for decoded audio playback

## When to choose
- you need to decode or play audio formats unsupported natively by the browser
- you want a pluggable framework for building JavaScript audio decoders
- you need consistent audio playback across browser and Node.js

## When to avoid
- you only need to play formats the browser already supports natively via <audio> or Web Audio API
- you need a maintained, actively developed solution
- you need high-performance or low-latency decoding

## Facets
- artifact type: framework
- maturity: maintenance
- function: audio-processing, sdk, plugin-system
- domain: web-development, media
- platform: browser, cross-platform
- tags: audio-decoding, codecs, javascript, coffeescript, browser-audio, demuxer, web-audio, audio, nodejs

## Member repositories
- audiocogs/aurora.js (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:12.270521+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 2026-08-30T05:03:16.044197+00:00, confidence not recorded.
  - readme: https://github.com/audiocogs/aurora.js (fetched 2026-08-28T04:04:12.270521+00:00, sha a04556aa0a9c)
  - homepage: http://audiocogs.org/codecs (fetched 2026-08-29T12:14:42.126098+00:00, sha a19cc5297b1b)
- Data as of 2026-08-30T08:39:29.467469+00:00.