nlohmann / json

JSON for Modern C++

simdjson / simdjson

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

tidwall / gjson

Get JSON values quickly - JSON parser for Go

buger / jsonparser

THE fastest alternative JSON parser for Go that does not require schema

alibaba / fastjson2

🚄 FASTJSON2 is a Java JSON library with excellent performance.

ohler55 / oj

Optimized JSON

simplejson / simplejson

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

uhop / stream-json

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.

danielaparker / jsoncons

A C++, header-only library for constructing JSON and JSON-like data formats, with JSON Pointer, JSON Patch, JSON Schema, JSONPath, JMESPath, CSV, MessagePack, CBOR, BSON, UBJSON, toon-format

ruby / json

JSON implementation for Ruby

SwiftyLab / MetaCodable

Supercharge Swift's Codable implementations with macros meta-programming.

dvidelabs / flatcc

FlatBuffers Compiler and Library in C for C

pydantic / jiter

Fast iterable JSON parser.

argonaut-io / argonaut

Purely functional JSON parser and library in scala.

python-rapidjson / python-rapidjson

Python wrapper around rapidjson

beached / daw_json_link

Fast, convenient JSON serialization and parsing in C++

jay-rrrr / AMVGG-Data-Harvest

AMVGG 2026 Parser and Data Cleaner: Ultimate All-Category Dumper Tool

tooladda-online / json-to-csv-converter

JSON to CSV Converter — Paste, upload, drag & drop, or import JSON from a URL and get a clean, downloadable CSV instantly — with a tree view, spreadsheet-style CSV preview, live validation, nested-object flattening, column mapping, and TSV/Excel-compatible export. Nothing ever leaves your browser. Free on ToolAdda.online.