JSON for Modern C++

FlatBuffers: Memory Efficient Serialization Library

FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.

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

The better way to deal with JSON data in Swift.

Get JSON values quickly - JSON parser for Go

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

One of the fastest alternative JSON parser for Go that does not require schema

Fast JSON serializer for golang.

🚄 FASTJSON2 is a Java JSON library with excellent performance.

Jodd! Lightweight. Java. Zero dependencies. Use what you like.

Optimized JSON

Fast JSON parser and validator for Go. No custom structs, no code generation, no reflection

An incredibly fast, pure Elixir JSON library

simplejson is a simple, fast, extensible JSON encoder/decoder for Python

jsoniter (json-iterator) is fast and flexible JSON parser available in Java and Go

Lightweight JSON library written in C.

Converter utility between XML text and Javascript object / JSON text.

Efficient, easy-to-use, and fast PHP JSON stream parser

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.