cstr/stockfish-js-wasm

Stockfish.js WASM (GPL-3.0)

Stockfish 18 compiled to JavaScript/WebAssembly for browser use. Hosted here for CORS-friendly access from web chess applications.

License: GPL-3.0 — Stockfish is free software under the GNU General Public License.

Files

File	Size	Description
stockfish-18-lite-single.js	~21KB	JS loader (single-threaded, lite NNUE)
stockfish.wasm	~7.3MB	WASM binary (lite NNUE network embedded)

Source

Built from nmrugg/stockfish.js v18.0.0. Original Stockfish engine: official-stockfish/Stockfish.

Usage

Load as a Web Worker. The JS loader fetches stockfish.wasm from the same directory. Communicates via UCI protocol over postMessage.

Used by CrispChess — downloaded at runtime, never bundled with the MIT-licensed app.