Parser

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A parser turns its input (often text in form of a file) into a more advantageous representation (usually a certain data structure in memory) to perform a specific task.

Common examples include:

parsers for markup languages (e.g. HTML/Markdown etc)

parsers for data-serialization formats (e.g. JSON/XML/YAML etc)

parsers used as part of/in conjunction with a compiler (in this case, the parser consumes the tokenized input emitted by the Lexer and ultimately feeds the resulting parse tree/concrete syntax tree into the compiler)

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opendatalab /MinerU

Star45.4k

Transforms complex documents like PDFs into LLM-ready markdown/JSON for your Agentic workflows.

python pdf parser ocr pdf-converter extract-data document-analysis pdf-parser layout-analysis ai4science pdf-extractor-rag pdf-extractor-llm pdf-extractor-pretrain

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Python

markedjs /marked

Star35.8k

A markdown parser and compiler. Built for speed.

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JavaScript

swc-project /swc

Sponsor

Star32.8k

Rust-based platform for the Web

javascript rust parser babel typescript compiler ecmascript swc typescript-compiler typescript-parser ecmascript-parser

UpdatedOct 7, 2025
Rust

cheeriojs /cheerio

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Star29.8k

The fast, flexible, and elegant library for parsing and manipulating HTML and XML.

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UpdatedOct 7, 2025
TypeScript

postcss /postcss

Star28.9k

Transforming styles with JS plugins

css parser framework postcss ast

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tree-sitter /tree-sitter

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Star22.3k

An incremental parsing system for programming tools

c rust tree-sitter parser parsing incremental wasm

UpdatedOct 7, 2025
Rust

vectordotdev /vector

Star20.4k

A high-performance observability data pipeline.

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Rust

nikic /PHP-Parser

Star17.4k

A PHP parser written in PHP

php parser static-analysis ast

UpdatedSep 8, 2025
PHP

oxc-project /oxc

Star16.6k

⚓ A collection of JavaScript tools written in Rust.

javascript parser typescript compiler linter transpiler minifier

UpdatedOct 8, 2025
Rust

erusev /parsedown

Star15k

Better Markdown Parser in PHP

markdown php parser markdown-parser

UpdatedAug 31, 2025
PHP

json-iterator /go

Star13.9k

A high-performance 100% compatible drop-in replacement of "encoding/json"

go golang serialization parser json serializer deserialization json-parser

UpdatedMay 27, 2024
Go

jhy /jsoup

Sponsor

Star11.3k

jsoup: the Java HTML parser, built for HTML editing, cleaning, scraping, and XSS safety.

css java html parser dom xml jsoup xpath css-selectors java-html-parser

UpdatedOct 7, 2025
Java

munificent /craftinginterpreters

Star10.1k

Repository for the book "Crafting Interpreters"

c java language markdown parser interpreter bytecode compiler book scripting-language lox

UpdatedAug 7, 2024
HTML

rust-bakery /nom

Star10.1k

Rust parser combinator framework

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Rust

terser /terser

Star9.1k

🗜 JavaScript parser, mangler and compressor toolkit for ES6+

javascript parser es6 uglifyjs compressor mangler

UpdatedSep 25, 2025
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tobymao /sqlglot

Star8.4k

Python SQL Parser and Transpiler

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UpdatedOct 7, 2025
Python

mvdan /sh

Sponsor

Star8.1k

A shell parser, formatter, and interpreter with bash support; includes shfmt

go shell bash parser formatter interpreter beautify posix mksh shfmt

UpdatedOct 7, 2025
Go

TomWright /dasel

Sponsor

Star7.6k

Select, put and delete data from JSON, TOML, YAML, XML and CSV files with a single tool. Supports conversion between formats and can be used as a Go package.