omggif is a JavaScript implementation of a GIF 89a encoder and decoder.

Decode audio files using FFmpeg and WebAssembly

Decode MP3 audio with mpg123 WASM

Performant JPEG decoder

JS/WebAssembly build of [OpenJPEG](https://github.com/uclouvain/openjpeg)

Decode AAC/M4A (FAAD2 WASM) and ALAC/Apple Lossless (pure JS) to PCM samples

A JavaScript port of [The "Quite OK Audio" (QOA) format](https://github.com/phoboslab/qoa), a lossy audio compression that achieves relatively decent compression with fast decoding and not much complexity. Also see [this](https://phoboslab.org/log/2023/02

Decode AMR-NB/WB audio via opencore-amr WASM

Draco is a library for compressing and decompressing 3D geometric meshes and point clouds. It is intended to improve the storage and transmission of 3D graphics.

Decode WMA audio via RockBox WASM

Decode AIFF/AIFF-C audio to PCM samples

Nodejs and Javascript library for decoding data params and events from ethereum transactions"

A fast Base64 decoder with a low level API. If you want a high level API, look at [base64-js](https://github.com/beatgammit/base64-js).

Decode CAF (Core Audio Format) audio to PCM samples

A pure JavaScript BPE tokenizer with model metadata and pricing for GPT-5, GPT-4o, o-series, and other OpenAI models

promise-based wav decoder

This decoder library leverages FFmpeg for efficient audio decoding. It simplifies processing of input audio, particularly as a preprocessing step for other addons.

Aedes plugin to decode connection frame and validate proxies

Small, fast and advanced PNG / APNG encoder and decoder

A TextDecoder replacement