Work in progress Stockfish REST API

making this for my own chess discord bots and other chess software that need stockfish best moves within 3 seconds. (I'm NOT trying to sell this or whatever in the name of Stockfish), mostly used for internal software, and of course it be free if I deploy it for other devs!!

Credits to:

• Stockfish.wsm
• The Stockfish developers (see AUTHORS file). Stockfish [Computer software]. https://github.com/official-stockfish/Stockfish (thanks to everyone! Truly genius devs out there)
• Stockfish js for understanding the flow [moving it to the server rather than node dependency]
• Stockfish standalone nodejs server, I used this for some help, not really but you get the point
• fen-validator so I don't need to do all that FEN regex stuff

Running it:

• running on debug mode which runs the engine on server start by selecting engine mode (wasm or cc-nonnue) or run help to see server commands
• node server.js debug wasm
• • node server.js debug cc-nonnue
• node server.js debug cc-yesnnue
• node server --help
• running without debug mode and starting the server
• node server.js

Endpoint parameters

• mode = run webassembly Stockfish (wasm) or No NNUE ChessCom Stockfish 16 (cc-nonnue) or Yes NNUE ChessCom Stockfish 16 (cc-yesnnue)
• depth = for wasm implementation [1 to 20] for Chesscom Stockfish 16 no NNUE version [1 to 16], for ChessCom Stockfish 16 yes NNUE version [1 to 22+] cap at depth 22, if one needs more they can request it
• fen = chess FEN for given position

Working endpoints

• Get best move for current FEN and MODE (pass in engine mode [wasm, cc-nonnue]) GET localhost:5000/stockfish/bestmove?fen=rnbqkbnr/pppp1ppp/4p3/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2
• Get eval for current FEN and MODE(pass in engine mode [wasm, cc-nonnue]) GET localhost:5000/stockfish/eval?fen=rnbqkbnr/pppp1ppp/4p3/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2
• Get top engine line and depth info for given engine MODE and DEPTH and FEN
• GET localhost:5000/stockfish/toplines?fen=rnbqkbnr/pppp1ppp/4p3/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2&depth=20&mode=wasm
• GET localhost:5000/stockfish/toplines?fen=rnbqkbnr/pppp1ppp/4p3/8/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2&depth=16&mode=16

TODOs

• add NNUE engine type to bestmove (fixed needs review)
• add NNUE engine type to eval (fixed needs review)
• add NNUE engine type to lines (buggy code)
• change lines to pv

License:

follows same as Stockfish GPL