1.ijl / orjson
Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy
+123 stars
from 8,160 · score 4.82
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Ranked by Attention Score: stars gained over the last 90 complete days
12 repositories by Attention Score · Aug 5, 2026 – Nov 2, 2026 (UTC)
2.ibireme / yyjson
The fastest JSON library in C
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3.felixguendling / cista
Cista is a simple, high-performance, zero-copy C++ serialization & reflection library.
+27 stars
from 2,229 · score 3.33
4.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
+21 stars
from 7,224 · score 3.09
5.Zulu-Inuoe / jzon
A correct and safe(er) JSON RFC 8259 reader/writer with sane defaults.
+10 stars
from 193 · score 2.40
6.alibaba / fastjsonArchived
FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.
+9 stars
from 25,553 · score 2.30
7.jorgen / json_struct
json_struct is a single header only C++ library for parsing JSON directly to C++ structs and vice versa
+7 stars
from 468 · score 2.08
8.json-iterator / goArchived
A high-performance 100% compatible drop-in replacement of "encoding/json"
+5 stars
from 13,849 · score 1.79
9.jamescourtney / FlatSharp
Fast, idiomatic C# implementation of Flatbuffers
+4 stars
from 569 · score 1.61
10.alibaba / HandyJSON
A handy swift json-object serialization/deserialization library
+2 stars
from 4,254 · score 1.10
11.EmberEmu / Hexi
Header-only, lightweight C++ library for binary streaming & serialization. Network data handling made easy peasy!
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from 287 · score 1.10
12.cweiske / jsonmapper
Map nested JSON structures onto PHP classes
+1 stars
from 1,574 · score 0.69