Parser Building Toolkit for JavaScript

Blazing Fast

Several times faster than other JavaScript parsing libraries. Can even compete with the performance of hand-crafted parsers.

Ease of Development

Chevrotain is an internal JavaScript DSL, no code generation or new tools needed to develop, run & debug. Just use your favorite JavaScript IDE.


Separation of syntax and semantics enables cleaner code and grammar reuse.

Fault Tolerant

Implements error recovery heuristics to parse even partially invalid inputs.

Syntax Diagrams

Easily generate syntax diagrams for documentation purposes.