PEG.js

PEG.js is a grammar language created in 2010 by David Majda.

#318on PLDB	13Years Old	5.7kUsers
0Books	0Papers	72Repos

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PEG.js is a simple parser generator for JavaScript that produces fast parsers with excellent error reporting. You can use it to process complex data or computer languages and build transformers, interpreters, compilers and other tools easily.

PEG.js website
PEG.js is developed on GitHub and has 4,410 stars
There are at least 72 PEG.js repos on GitHub
PEG.js first developed in https://github.com/pegjs
file extensions for PEG.js include pegjs
PEG.js compiles to JavaScript
PEG.js on Twitter
The Google BigQuery Public Dataset GitHub snapshot shows 63 users using PEG.js in 63 repos on GitHub
HTML of this page generated by LanguagePage.ts

Example from the web:

start
 = additive

additive
  = left:multiplicative "+" right:additive { return left + right; }
  / multiplicative

multiplicative
  = left:primary "*" right:multiplicative { return left * right; }
  / primary

primary
  = integer
  / "(" additive:additive ")" { return additive; }

integer "integer"
  = digits:[0-9]+ { return parseInt(digits.join(""), 10); }

Feature	Supported	Token	Example
Comments	✓		// A comment
MultiLine Comments	✓	/* */	/* A comment */
Line Comments	✓	//	// A comment
Semantic Indentation	X

PEG.js - Grammar language

Language features