nearley is a powerful and efficient parsing toolkit for JavaScript that enables developers to create parsers for various grammars, including those that other parsers struggle with, such as left-recursive ones. It features a modular DSL for language description, an Earley parser for efficient parsing, and tools for testing, diagram generation, and fuzzing. This project is ideal for developers working on compilers, data-driven markup languages, file format parsers, or academic projects in artificial intelligence and computational linguistics.