About

JavaScript audio feature extraction library for building audio-reactive web and Node.js projects.

Meyda extracts audio features such as RMS loudness, spectral centroid, spectral flatness, chroma, MFCCs and perceptual loudness from audio in the browser via the Web Audio API, or offline in Node.js.

Higher-level features like these produce more musical audio reactivity than raw FFT bins alone. Hydra uses Meyda for its audio input. Meyda is MIT licensed.

Features & Use Cases

RMS, spectral centroid, flatness and rolloff
Chroma and MFCC
Real-time Web Audio analyser
Offline Node.js use
MIT licensed

Pricing

Free and open source.

View current pricing

Sources

meyda.js.org
github.com

Pricing checked 3 October 2026.