ibireme/yyjson

Health v2 · maintenance only

Adoption not part of the score

3849 stars · 341 forks observed · 2026-08-28

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

yyjson is a high-performance JSON parsing and serialization library written in ANSI C (C89), capable of reading and writing gigabytes of JSON per second. It supports RFC 8259, optional JSON5 features, JSON Pointer/Patch/Merge Patch manipulation, and integrates as a single .h and .c file.

Use cases

• parse large json files fast in c
• serialize json with high throughput
• embed a portable json parser in an ansi c project
• query and modify json with json pointer and patch
• parse json5 documents with relaxed syntax
• replace cjson or rapidjson for faster json processing

When to choose

• you need maximum JSON parse/serialize speed in C or C++
• you need strict RFC 8259 compliance with accurate int64/uint64/double handling
• you want a dependency-free, portable C89 library that drops into any project
• you target constrained or cross-platform environments including mobile and embedded

When to avoid

• you need frequent random access by index or key - iterators are faster than its linked-list DOM
• you need mutable parsed documents - results are immutable and require a mutable copy
• you need SIMD-accelerated compile-time-known field parsing, where simdjson's On Demand API may be faster

Facets

library · maturity stable

serialization parser json developer-tools parsers performance apis cross-platform c cpp windows embedded json5 json-pointer json-patch high-performance ansi-c single-file immutable-dom linux macos ios android

Member repositories

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