Chevrotain/chevrotain

Health v2 · maintenance only

Adoption not part of the score

2797 stars · 221 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Chevrotain is a fast, feature-rich parser building toolkit for JavaScript with built-in LL(K) grammar support. Grammars are written as pure JavaScript/TypeScript source without a code generation phase, usable from simple config files to full programming languages.

Use cases

• build a parser for a custom DSL in JavaScript
• write a lexer and tokenizer for a new language
• parse configuration files with a custom grammar
• build an interpreter or compiler frontend in TypeScript
• implement syntax highlighting by tokenizing source code
• replace parser generators with a no-codegen parsing library

When to choose

• you need high-performance parsing in JavaScript or TypeScript
• you want grammars as plain code without a code generation build step
• you need fine control over lexer and parser error recovery

When to avoid

• you prefer declarative grammar files with generated parsers (e.g., ANTLR)
• you need PEG or GLR parsing rather than LL(K)/LL(*)
• you are not working in a JavaScript runtime

Facets

library · maturity stable

parser compiler developer-tools parsers programming-languages developer-tools browser lexer tokenizer ll-k grammar dsl syntax-analysis no-code-generation nodejs javascript typescript

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markdown · JSON · MCP: product_card(name="Chevrotain/chevrotain")