json-parser

nlohmann/json

+30

JSON for Modern C++

simdjson

+29

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

flatbuffers

+14

FlatBuffers: Memory Efficient Serialization Library

stream-json

+1

A micro-library of stream components for building custom JSON and JSONC processing pipelines with a minimal memory footprint — parse, filter, and transform JSON far larger than available memory with a SAX-inspired token API, on Node.js or Web Streams.

ohler55/oj

+1

Optimized JSON

kgabis/parson

+1

Lightweight JSON library written in C.