Q: What javascript libraries exist to create parsers and DSLs, can you share any npm or open source

A: Creating a Domain Specific Language (DSL) involves parsing input according to the syntax rules of your DSL and then interpreting or compiling that parsed input. To create parsers and interpreters/compilers in JavaScript, you have several libraries available:

PEG.js: 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 syntax highlighting.

• Github: https://github.com/pegjs/pegjs

• npm: https://www.npmjs.com/package/pegjs

Nearley: Nearley is a fast, feature-rich, and modern parser toolkit for JavaScript. It’s simple enough to use for small projects, but powerful enough to handle complex grammars.

• Github: https://github.com/kach/nearley

• npm: https://www.npmjs.com/package/nearley

Chevrotain: 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 programming languages.

• Github: https://github.com/Chevrotain/chevrotain

• npm: https://www.npmjs.com/package/chevrotain

ANTLR: ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks.

• Github: https://github.com/antlr/antlr4

• npm: https://www.npmjs.com/package/antlr4

Jison: Jison is an API for building parsers, similar to Bison for JavaScript. It takes a JSON encoded grammar specification and outputs a JavaScript parser that can parse the language described by the grammar.

• Github: https://github.com/zaach/jison

• npm: https://www.npmjs.com/package/jison

Please note that creating a DSL is a complex task that requires a thorough understanding of language design and parsing techniques. Each of these libraries has different features, benefits, and trade-offs, so you should choose the one that best fits your specific needs.