Chevrotain is a blazing fast and feature rich Parser Building Toolkit for JavaScript. It can be used to build parsers/compilers/interpreters for various use cases ranging from simple configuration files, to full fledged programing languages.

A more in depth description of Chevrotain can be found in this great article on: Parsing in JavaScript: Tools and Libraries.

It is important to note that Chevrotain is NOT a parser generator. It solves the same kind of problems as a parser generator, just without any code generation. Chevrotain Grammars are pure code which can be created/debugged/edited as any other pure code without requiring any new tools or processes.

• Online Playground
• Getting Started Tutorial
• Performance benchmark

• npm: npm install chevrotain
• Browser: The npm package contains Chevrotain as concatenated and minified files ready for use in a browser. These can also be accessed directly via UNPKG in a script tag.
  • Latest:
    • https://unpkg.com/chevrotain/lib/chevrotain.js
    • https://unpkg.com/chevrotain/lib/chevrotain.min.js
  • Explicit version number:
    • https://unpkg.com/[email protected]/lib/chevrotain.js
    • https://unpkg.com/[email protected]/lib/chevrotain.min.js

• Getting Started Tutorial.

• Sample Grammars.

• FAQ.

• Other Examples.

• HTML API docs.

  • The Parsing DSL Docs.

There is a single dependency to regexp-to-ast library. This dependency is included in the bundled artifacts, for ease of consumption in browsers.

Chevrotain runs on any modern JavaScript ES5.1 runtime.

• The CI build runs the tests under:

  • Node.js (6 / 8 / 10).
  • Latest stable: Chrome, FireFox, Safari, IE Edge and IE 11.

• Uses UMD to work with common module loaders (browser global / amd / commonjs).

Contributions are greatly appreciated. See CONTRIBUTING.md for details.

Some interesting samples:

• JHipster Domain Language
• Metabase BI expression parser.
• Eve Programing Language.
• BioModelAnalyzer's ChatBot parser.
• Bombadil Toml Parser
• BrightScript Parser