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A JavaScript library for batch analyzing chess games

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![Chessalyzer](https://raw.githubusercontent.com/yschroe/chessalyzer/main/docs/public/logo.svg)

# Chessalyzer

A JavaScript library for batch-analyzing chess PGN files — parse games, replay moves, and collect statistics with modular trackers.

> **Previously published as [`chessalyzer.js`](https://www.npmjs.com/package/chessalyzer.js)** through v3. From v4 onward the package name is `chessalyzer`.

[![npm version](https://badge.fury.io/js/chessalyzer.svg)](https://badge.fury.io/js/chessalyzer)

## Features

- Zero-dependency chess analysis and PGN parsing toolkit
- Batch process PGN files and track statistics of your games
- Filter games (e.g. only analyze games where WhiteElo > 1800)
- Fully modular, track only the statistics you need
- Generate heatmaps out of the generated data
- Standalone fast PGN parser with sync and async streaming mode
- Handles big files easily

## Documentation

Guides for installation, basic usage, the analysis pipeline, built-in and custom trackers, heatmaps, filtering, multithreading, error handling, and more can be found in the **[Documentation](https://yschroe.github.io/chessalyzer/)**.

## Installation

```sh
npm install chessalyzer
```

Requires any JavaScript runtime, Node.js ≥ 22 or Bun recommended.

## Getting started

```typescript
import { analyzePGN } from 'chessalyzer';
import {
    tileTracker,
    generateHeatmap,
    TileHeatmapPresets,
    printHeatmap,
} from 'chessalyzer/trackers';

const tiles = tileTracker();

await analyzePGN('<pathToPgnFile>', { trackers: [tiles] });

const heatmap = generateHeatmap(tiles.state, TileHeatmapPresets.TILE_OCC_ALL);

printHeatmap(heatmap);
```

For filtering, comparison runs, custom trackers, and everything else, see the [documentation](https://yschroe.github.io/chessalyzer/).

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