ohmjs/ohm

Health v2 · maintenance only

Adoption not part of the score

5543 stars · 226 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Ohm is a parsing toolkit consisting of a JavaScript library and a domain-specific language based on parsing expression grammars (PEGs). It is used to build parsers, interpreters, and compilers for custom file formats and programming languages.

Use cases

• parse a custom file format in JavaScript
• build a DSL with a parser and interpreter
• create a programming language compiler
• define grammars with left-recursive rules
• prototype language syntax with an online grammar editor
• separate grammar definitions from semantic actions

When to choose

• you need a parser for a custom language or file format in JavaScript/TypeScript
• you want modular separation of grammars and semantic actions
• you need natural support for left-recursive and left-associative rules
• you want to iteratively develop grammars with visual feedback

When to avoid

• you need a parser in a language other than JavaScript
• you only need simple regex-based text matching
• you need maximum parsing performance for huge inputs

Facets

library · maturity active

parser compiler interpreter programming-language parsers programming-languages developer-tools compilers browser peg grammars parsing-toolkit dsl semantic-actions left-recursion javascript nodejs typescript

Member repositories

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markdown · JSON · MCP: product_card(name="ohmjs/ohm")