jhlywa/chess.js

Health v2 · maintenance only

Adoption not part of the score

4388 stars · 986 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

chess.js is a TypeScript chess library providing move generation and validation, piece placement and movement, and check/checkmate/stalemate detection. It is a headless library with no UI, designed to run in Node.js and modern browsers and pair with board-rendering libraries like chessboard.js.

Use cases

• validate chess moves in a web chess game
• generate legal moves for a chess engine or bot
• detect check, checkmate, and stalemate in an app
• parse and produce PGN and FEN chess notation
• build a chess puzzle or training tool
• play out random or scripted games programmatically

When to choose

• you need reliable chess rules logic in JavaScript or TypeScript
• you are building a chess UI and need a headless rules engine
• you need PGN/FEN parsing with both permissive and strict modes

When to avoid

• you need a chess AI or engine evaluation - it explicitly excludes AI
• you need a graphical chessboard or UI components
• you are working outside JavaScript/TypeScript ecosystems

Facets

library · maturity stable

parser sdk developer-tools gaming-tools developer-tools browser cross-platform chess game-logic typescript move-generation pgn fen board-games algorithms nodejs javascript

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