jneen/parsimmon

Health v2 · maintenance only

Adoption not part of the score

1273 stars · 128 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Parsimmon is a small monadic LL(infinity) parser combinator library for JavaScript, inspired by parsec and Promises/A+. It lets you build large parsers from many small composable parsers, running in Node.js and browsers (IE7+).

Use cases

• write a parser for a custom DSL in javascript
• parse JSON-like configuration files in node
• build a lisp or math expression parser
• parse custom text formats with combinators
• implement a small programming language parser in the browser
• tokenize and parse structured text without regex soup

When to choose

• you want a lightweight, dependency-free parser combinator library in JavaScript
• you need to parse small custom languages or formats in Node or the browser
• you prefer a parsec-style monadic API over grammar-generator tools

When to avoid

• you need an actively maintained library with ongoing bug fixes (the project is explicitly unmaintained)
• you need maximum parsing performance for large grammars
• you want a grammar-file-based parser generator like ANTLR or PEG.js

Facets

library · maturity abandoned

parser parsers programming-languages developer-tools browser cross-platform parser-combinators monadic javascript unmaintained nodejs

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