# jsantell/dancer.js

high-level audio API, designed to make sweet visualizations

Repository: https://github.com/jsantell/dancer.js
Canonical: https://ross.abutalabs.com/products/dancerjs
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2022-07-19T07:33:54+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5275, "days_push": 1506, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2096, forks 202 (observed 2026-08-28T04:06:13.290527+00:00)

## What it is
dancer.js is a high-level JavaScript audio API that wraps Web Audio API (with Audio Data API and Flash fallbacks) to expose real-time waveform and frequency data for building audio visualizations. It provides kick detection, time-based section callbacks, and an extensible plugin system for mapping audio data to arbitrary visual effects.

## Use cases
- create music visualizations in the browser
- get real-time frequency spectrum data from audio
- detect beats or kicks in a song to trigger animations
- sync visual callbacks to specific sections of a track
- analyze waveform data from an audio element
- build an audio player with reactive graphics

## When to choose
- you need a simple high-level API over Web Audio for visualization projects
- you want beat/kick detection and time-based callbacks out of the box
- you need legacy browser support via Audio Data API or Flash fallback

## When to avoid
- you need modern, actively maintained audio tooling - the core code dates to 2014 and Flash fallback is obsolete
- you only need low-level Web Audio API access, use AnalyserNode directly
- you are building non-browser or streaming audio applications

## Facets
- artifact type: library
- maturity: maintenance
- function: audio-processing, animation, plugin-system
- domain: web-development, graphics, media
- platform: browser
- tags: web-audio-api, audio-visualization, music-visualizer, frequency-analysis, waveform, kick-detection, flash-fallback, audio, javascript, web

## Member repositories
- jsantell/dancer.js (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:13.290527+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 2026-08-30T02:54:37.677492+00:00, confidence not recorded.
  - readme: https://github.com/jsantell/dancer.js (fetched 2026-08-28T04:06:13.290527+00:00, sha a30ebc31d729)
- Data as of 2026-08-30T08:39:29.467469+00:00.