Peggy Parser Generator

Peggy is a robust, open-source parser generator for JavaScript that serves as the successor to the popular PEG.js project. It enables developers to define grammars using a simple and expressive syntax based on parsing expression grammar (PEG) formalism, which is more powerful than traditional LL(k) and LR(k) parsers. Peggy integrates both lexical and syntactical analysis and produces fast parsers with excellent error reporting capabilities. The current stable version is 5.1.0, with regular patch and minor releases, and major versions released less frequently. Key differentiators include its superior error reporting, integration of lexical and syntactical analysis, and being usable across various environments: browsers (via an online tool), command line, and as a JavaScript API. It also provides source map support and ships with TypeScript definitions, making it well-suited for modern JavaScript and TypeScript development workflows. It requires Node.js version 20 or higher.