parse

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A grammar describes the syntax of a programming language, and might be defined in Backus-Naur form (BNF). A lexer performs lexical analysis, turning text into tokens. A parser takes tokens and builds a data structure like an abstract syntax tree (AST). The parser is concerned with context: does the sequence of tokens fit the grammar? A compiler is a combined lexer and parser, built for a specific grammar.

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antlr /antlr4

Star18.6k

ANTLR (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files.

javascript python java dart swift golang php parse csharp parsing cpp parser-generator grammar antlr antlr4 language-recognition

UpdatedDec 5, 2025
Java

rust-bakery /nom

Star10.2k

Rust parser combinator framework

rust parser parse parser-combinators grammar nom byte-array

UpdatedAug 26, 2025
Rust

ljharb /qs

Sponsor

Star8.9k

A querystring parser and serializer with nesting support

nodejs javascript encoding node parse querystrings stringify url-parsing browsers

UpdatedDec 3, 2025
JavaScript

sindresorhus /query-string

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Star6.9k

Parse and stringify URL query strings

url parse npm-package stringify urlsearchparams query-string

UpdatedSep 19, 2025
JavaScript

jonschlinkert /remarkable

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Star5.8k

Markdown parser, done right. Commonmark support, extensions, syntax plugins, high speed - all in one. Gulp and metalsmith plugins available. Used by Facebook, Docusaurus and many others! Usehttps://github.com/breakdance/breakdance for HTML-to-markdown conversion. Usehttps://github.com/jonschlinkert/markdown-toc to generate a table of contents.

nodejs javascript syntax-highlighting markdown gfm parser node parse markdown-parser commonmark compile md markdown-it jonschlinkert docusaurus

UpdatedMay 17, 2024
JavaScript

lark-parser /lark

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Star5.7k

Lark is a parsing toolkit for Python, built with a focus on ergonomics, performance and modularity.

python parser tree parse parser-library grammar parsing-engine lark earley lalr parsing-library cyk

UpdatedOct 31, 2025
Python

scinfu /SwiftSoup

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Star5k

SwiftSoup: Pure Swift HTML Parser, with best of DOM, CSS, and jquery (Supports Linux, iOS, Mac, tvOS, watchOS)

html swift parse dom extract selector html-document swiftsoup

UpdatedDec 9, 2025
Swift

jonschlinkert /gray-matter

Sponsor

Star4.3k

Smarter YAML front matter parser, used by metalsmith, Gatsby, Netlify, Assemble, mapbox-gl, phenomic, vuejs vitepress, TinaCMS, Shopify Polaris, Ant Design, Astro, hashicorp, garden, slidev, saber, sourcegraph, and many others. Simple to use, and battle tested. Parses YAML by default but can also parse JSON Front Matter, Coffee Front Matter, TOM…

nodejs javascript config markdown matter yaml data node parse gatsby metalsmith mapbox netlify frontmatter assemble phenomic front-matter jonschlinkert front-matter-parsers

UpdatedJun 14, 2025
JavaScript

angularsen /UnitsNet

Star2.9k

Makes life working with units of measurement just a little bit better.

converter parse csharp powershell measure conversion units-of-measure units unit-converter abbreviations unit measurement measurements measures quantities quantity

UpdatedDec 7, 2025
C#

zzzprojects /html-agility-pack

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Star2.8k

Html Agility Pack (HAP) is a free and open-source HTML parser written in C# to read/write DOM and supports plain XPATH or XSLT. It is a .NET code library that allows you to parse "out of the web" HTML files.

parse html-parser xpath hap htmlagilitypack