Top 23 C Parser Projects

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1. StringZilla

   1 27 3,490 9.7 C

   Up to 100x faster strings for C, C++, CUDA, Python, Rust, Swift, JS, & Go, leveraging NEON, AVX2, AVX-512, SVE, GPGPU, & SWAR to accelerate search, hashing, sorting, edit distances, sketches, and memory ops 🦖

   

   Project mention: Jvector And Python! (Part 4 of jvector series) | dev.to | 2026-01-14

   Usearch (Smaller & Faster Single-File Similarity Search & Clustering Engine for Vectors & 🔜 Texts): https://github.com/unum-cloud/usearch

2. SaaSHub

   www.saashub.com featured

   SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

   

3. parson

   2 2 1,451 2.8 C

   Lightweight JSON library written in C.

   

4. md4c

   3 5 1,365 9.1 C

   C Markdown parser. Fast. SAX-like interface. Compliant to CommonMark specification.

   

5. tree-sitter-markdown

   4 10 609 7.2 C

   Markdown grammar for tree-sitter

   

   Project mention: Show HN: Ferrite – Markdown editor in Rust with native Mermaid diagram rendering | news.ycombinator.com | 2026-01-10

   This is cool. I was hoping to see progress coming from Zed (e.g. because Tree-sitter → https://github.com/tree-sitter-grammars/tree-sitter-markdown) but it's exciting to see this.

6. lwesp

   5 1 556 3.5 C

   Lightweight and versatile AT parser library for ESP8266 and ESP32 devices.

   

7. mini-c

   6 0 531 0.0 C

   Dr Strangehack, or: how to write a self-hosting C compiler in 10 hours

   

8. tiny-json

   7 4 428 0.0 C

   The tiny-json is a versatile and easy to use json parser in C suitable for embedded systems. It is fast, robust and portable.

   

9. link-grammar

   8 1 416 5.9 C

   The CMU Link Grammar natural language parser

   

10. packcc

    9 3 411 8.9 C

    A parser generator for C

    

11. jsonlite

    10 1 404 5.2 C

    Simple JSON Parser and Generator for R (by jeroen)

    

12. zsv

    11 29 389 8.9 C

    zsv+lib: tabular data swiss-army knife CLI + world's fastest (simd) CSV parser

    

    Project mention: Ruby CSV Parsing 5-6x Faster | dev.to | 2025-12-07

    I wrapped zsv, a SIMD-accelerated CSV parser written in C, into a Ruby gem. SIMD means it uses special CPU instructions to process multiple bytes at once - the same tech that makes video encoding and game physics fast.

13. gherkin

    12 3 351 9.7 C

    A parser and compiler for the Gherkin language.

    

    Project mention: Specsmaxxing – On overcoming AI psychosis, and why I write specs in YAML | news.ycombinator.com | 2026-05-03

    I agree, Cucumber works really well with LLMs.

    > I use a mix of Markdown and Gherkin

    Gherkin also has a Markdown based syntax that is not well known:

    https://github.com/cucumber/gherkin/blob/main/MARKDOWN_WITH_...

    I prefer that to the 'verbose' original syntax. MDG also renders nicely in code forges.

14. tree-sitter-bash

    13 5 311 5.8 C

    Bash grammar for tree-sitter

    

15. tree-sitter-ruby

    14 9 226 3.6 C

    Ruby grammar for tree-sitter

    

16. tree-sitter-html

    15 3 207 3.8 C

    HTML grammar for Tree-sitter

    

17. tree-sitter-haskell

    16 2 184 4.0 C

    Haskell grammar for tree-sitter.

    

18. libconfini

    17 9 181 0.0 C

    Yet another INI parser

    

    Project mention: MAML – a new configuration language (similar to JSON, YAML, and TOML) | news.ycombinator.com | 2025-10-12

    In practice, there are still types, they are just validated by your application. I didn’t want Confetti itself to make assumptions. I wanted to give you the freedom to define your own custom types and keywords, like “on” and “off”, or even tri-states like “yes”, “no”, “maybe”.

    The problem with mandatory keywords, like “true” and “false”, is they box you into the English language. And how many data types are baked in is arbitrary, for example, TOML has data types for date and time, but JSON does not [1]. Where do you draw the line? Confetti let’s you decide.

    You might enjoy reading this take on the subject [2].

    [1] https://toml.io/en/v1.0.0#offset-date-time

    [2] https://github.com/madmurphy/libconfini/wiki/An-INI-critique...

19. pl0c

    18 5 154 0.0 C

    Self-hosting PL/0 to C compiler to teach basic compiler construction from a practical, hands-on perspective.

    

20. gmime

    19 1 144 5.3 C

    A C/C++ MIME creation and parser library with support for S/MIME, PGP, and Unix mbox spools.

    

    Project mention: Incremental Backups of Gmail Takeouts | news.ycombinator.com | 2025-12-29

    Have you looked into using a full MIME/mbox parser library, e.g. GMime [0] or MimeKit [1]? Both support parsing mbox files directly, and they should be able to handle the intricacies of parsing any messages/attachments you throw at them. Then you could write out the MIME representation of each message (including any attachments) into its own file and then check for new messages. That way you can be sure each “chunk” represents a single message in its entirety. Not sure if this is any better since your solution seems to work pretty well.

    [0] https://github.com/jstedfast/gmime

    [1] https://github.com/jstedfast/MimeKit

21. libwifi

    20 2 138 2.7 C

    An 802.11 (WiFi) Frame Generation and Parsing Library in C

    

    Project mention: Libwifi: An 802.11 frame parsing and generation library written in C | news.ycombinator.com | 2025-11-15

22. sqlite-createtable-parser

    21 6 137 6.7 C

    A parser for SQLite create table sql statements.

    

23. serd

    22 1 98 8.0 C

    A lightweight C library for RDF syntax

    

24. stutter

    23 1 83 1.8 C

    Implement a Lisp, in C, from scratch, no libs (by mkirchner)

    

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