1.nlohmann / json
JSON for Modern C++
+1,625 stars
from 49,204 · score 7.39
Trending repositories
Ranked by Attention Score: stars gained over the last 180 complete days
18 repositories by Attention Score · May 7, 2026 – Nov 2, 2026 (UTC)
2.simdjson / simdjson
Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
+897 stars
from 23,597 · score 6.80
3.google / flatbuffers
FlatBuffers: Memory Efficient Serialization Library
+849 stars
from 25,752 · score 6.75
4.tidwall / gjson
Get JSON values quickly - JSON parser for Go
+158 stars
from 15,399 · score 5.07
5.SwiftyJSON / SwiftyJSON
The better way to deal with JSON data in Swift.
+75 stars
from 22,851 · score 4.33
6.alibaba / fastjsonArchived
FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.
+40 stars
from 25,522 · score 3.71
7.halaxa / json-machine
Efficient, easy-to-use, and fast PHP JSON stream parser
+37 stars
from 1,297 · score 3.64
8.kgabis / parson
Lightweight JSON library written in C.
+33 stars
from 1,444 · score 3.53
9.ohler55 / oj
Optimized JSON
+32 stars
from 3,196 · score 3.50
10.json-iterator / goArchived
A high-performance 100% compatible drop-in replacement of "encoding/json"
+29 stars
from 13,825 · score 3.40
11.valyala / fastjson
Fast JSON parser and validator for Go. No custom structs, no code generation, no reflection
+29 stars
from 2,434 · score 3.40
12.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
+24 stars
from 831 · score 3.22
13.gecko0307 / dlib
Allocators, I/O streams, math, geometry, image and audio processing for D
+7 stars
from 224 · score 2.08
14.simplejson / simplejson
simplejson is a simple, fast, extensible JSON encoder/decoder for Python
+5 stars
from 1,705 · score 1.79
15.devinus / poison
An incredibly fast, pure Elixir JSON library
+4 stars
from 2,026 · score 1.61
16.gurkankaymak / hocon
go implementation of lightbend's HOCON configuration library https://github.com/lightbend/config
+3 stars
from 88 · score 1.39
17.argonaut-io / argonaut
Purely functional JSON parser and library in scala.
+1 stars
from 543 · score 0.69
18.biot2 / Yaml.Json.Parser.pas
YAML and JSON parser, serializer and deserializer with YAML to JSON and vice versa conversion tools containing pure Object Pascal source code for both Delphi and Lazarus
+1 stars
from 8 · score 0.69