A highly flexible React Native library for creating and editing chess board positions (FEN strings) without enforcing game rules

Validate and parse Forsyth-Edwards Notation (FEN) used to describe a chess game board position.

Convert chessboard images into FEN notation

A simple package for validating Chess games (fen strings)

FEN to ECO code mappings

All-in-one React chessboard UI with a built-in chess engine, FEN state control, move validation, drag-and-drop pieces, game-end callbacks, and customizable styles.

Analyses a given chess game position in Fen notation to return legal moves and provides the next game position after a given move

Fen And Zhu

A chess engine designed to work entirely from a FEN position.

Chessboard component for vue based on fen notation

Module for keeping track of chess boards in Forsyth–Edwards Notation.

Simple code-only Chessboard written in TypeScript. Handles FEN and PGN.

Generate high-quality Chess Boards (like chess.com & lichess) through FEN, PGN & Arrays using Napi-RS.

MCP server that gives an LLM the best move for a chess position (FEN or PGN) via Stockfish.

Chess diagram toolkit — parse & edit FEN positions, manipulate boards, render SVG diagrams, board themes, color, image & DPI utilities. Works in Node.js and browsers.

A drop-in LiveKit audio call SDK for React Native: a connection hook and a ready-made call screen.

Production-ready JavaScript library for reading Polyglot opening book files (.bin) with FEN-based position lookup

Javascript PGN to FEN converter

Lightweight bitboard chess engine for position updates (FEN, Zobrist, SAN). No move validation; assumes validated input.

Creates an SVG chess board from a FEN string