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Top 23 C JSON Projects
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Redis
For developers, who are building real-time data-driven applications, Redis is the preferred, fastest, and most feature-rich cache, data structure server, and document and vector query engine.
Why a cache server? Well, to be, a cache system is the smallest piece of software one can found everywhere. There is a reason why redis, memcached or many other projects like that are used by everybody: developers need a way to store data quick. It could be for a session, for temporary data or simply to avoid annoying the main core database. A cache service is easy to create (key/value store), and can become rapidly something cool to hack. In fact, if you look a bit closely, any web server or database can be seen as a kind of "infinite" cache server, right?
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At some point I got tired of wrestling with JSON on STM32: writing endless boilerplate to walk through cJSON trees, hunting memory leaks, and guessing where malloc would betray me next. That’s when JsonX was born - a lightweight, minimalistic wrapper around cJSON, designed specifically for MCUs and RTOS.
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JSMN
Jsmn is a world fastest JSON parser/tokenizer. This is the official repo replacing the old one at Bitbucket
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Project mention: fastjson 0.3.0: A Faster Drop-In ext/json for PHP, Backed by yyjson | dev.to | 2026-05-20
fastjson is option three. It's a native PHP extension that wraps yyjson 0.12.0 (MIT, ~6K LOC of focused C) behind a namespaced API that mirrors ext/json's contract. PHP 8.3 minimum; 8.4 and 8.5 supported; coexists with ext/json.
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StringZilla
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 🦖
Usearch (Smaller & Faster Single-File Similarity Search & Clustering Engine for Vectors & 🔜 Texts): https://github.com/unum-cloud/usearch
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json-c
https://github.com/json-c/json-c is the official code repository for json-c. See the wiki for release tarballs for download. API docs at http://json-c.github.io/json-c/
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I got bitten yesterday by a PR submitted by Orbis Security that was a one line change that actually did nothing but was used to trumpet what an amazing fix it was for a blog article which was also full of inaccuracies.
The PR was useful though as it show that the supposed fix was in a function that was never called. I removed it this morning.
The PR if anyone is interested is https://github.com/ohler55/oj/pull/1011
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Project mention: The CRDT Dictionary: A Field Guide to Conflict-Free Replicated Data Types | news.ycombinator.com | 2025-11-29
Automerge is an excellent library, with a great API, not just in Rust, but also Javascript and C.
> All you need for the backend is key-value storage with range/prefix queries;
This is true, I was able to quickly put together a Redis automerge library that supports the full API, including pub/sub of changes to subscribers for a full persistent sync server [0]. I was surprised how quickly it came together. Using some LLM assistance (I'm not a frontend specialist) I was able to quickly put together a usable web demo of synchronized documents across multiple browsers using the Webdis [1] websocket support over pub/sub channels.
[0] https://github.com/michelp/redis-automerge
[1] https://webd.is/
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Project mention: UnQLite Embedded Database Engine 1.2.1 Released | news.ycombinator.com | 2026-05-02
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ejdb
:snowboarder: EJDB2 — Embeddable JSON Database engine C library. Simple XPath like query language (JQL).
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Melon
A generic cross-platform C library that includes many commonly used components and frameworks, and a new scripting language interpreter. It currently supports C99 and Aspect-Oriented Programming (AOP).
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UCall
Web Serving and Remote Procedure Calls at 50x lower latency and 70x higher bandwidth than FastAPI, implementing JSON-RPC & REST over io_uring ☎️
Yes, I was planning a similar experiment with UCall (https://github.com/unum-cloud/ucall), leveraging the NUMA functionality introduced in v2 of Fork Union. I don’t currently have the right hardware to test it properly, but it would be very interesting to measure how pinning behaves on machines with multiple NUMA nodes, NICs, and a balanced PCIe topology.
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pmacct
pmacct is a small set of multi-purpose passive network monitoring tools [NetFlow IPFIX sFlow libpcap BGP BMP RPKI IGP Streaming Telemetry].
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NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
C JSON discussion
C JSON related posts
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Redis 8.8: New array data structure, rate limiter, performance improvements
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Bijou64: A variable-length integer encoding
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fastjson 0.3.0: A Faster Drop-In ext/json for PHP, Backed by yyjson
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False Security
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Redis VS zedis - a user suggested alternative
2 projects | 9 May 2026 -
Redis 8.0 vs Memcached 1.6: 2026 Caching Comparison for High-Traffic Node.js 24 APIs
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Show HN: jsoon, a streaming JSON parser and query engine in C
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A note from our sponsor - SaaSHub
www.saashub.com | 10 Jun 2026
Index
What are some of the best open-source JSON projects in C? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | Redis | 74,716 |
| 2 | cJSON | 12,768 |
| 3 | tbox | 5,112 |
| 4 | gravity | 4,528 |
| 5 | JSMN | 4,132 |
| 6 | yyjson | 3,768 |
| 7 | StringZilla | 3,473 |
| 8 | Jansson | 3,336 |
| 9 | json-c | 3,273 |
| 10 | Oj | 3,218 |
| 11 | webdis | 2,956 |
| 12 | facil.io | 2,383 |
| 13 | unqlite | 2,303 |
| 14 | YAJL | 2,219 |
| 15 | LIBUCL | 1,734 |
| 16 | wal2json | 1,495 |
| 17 | ejdb | 1,473 |
| 18 | Melon | 1,454 |
| 19 | parson | 1,451 |
| 20 | json-parser | 1,332 |
| 21 | UCall | 1,327 |
| 22 | pmacct | 1,216 |
| 23 | OwnTracks Recorder | 1,175 |
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