A module to build parser combinators prs.js - the resulting parser is a top-down parser, also known a parsing expression parser PEG
This is a standalone script, you can use it both with nodejs and in a browser.
npm i prscombinator
or download library file from github: link
See the package page on npm
See the generated documentation
See example usage in test test
Also the PYX interpreter/shell is using this parser generator. here