+730 stars
from 50,108 · score 6.59
Trending repositories
Ranked by Attention Score: stars gained over the last 90 complete days
40 repositories by Attention Score · Aug 6, 2026 – Nov 3, 2026 (UTC)
2.toon-format / toon
🎒 Token-Oriented Object Notation (TOON) – compact, human-readable serialization of JSON data for LLM prompts. TypeScript SDK, CLI, benchmarks.
- data-format
- llm
- serialization
- tokenization
+659 stars
from 24,947 · score 6.49
3.protocolbuffers / protobuf
Protocol Buffers - Google's data interchange format
- protobuf
- protocol-buffers
- protocol-compiler
- protobuf-runtime
- protoc
- serialization
- +2 more
+635 stars
from 71,515 · score 6.46
4.simdjson / simdjson
Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
- json
- json-parser
- simd
- avx2
- sse42
- neon
- +14 more
+428 stars
from 24,072 · score 6.06
5.google / flatbuffers
FlatBuffers: Memory Efficient Serialization Library
- flatbuffers
- serialization
- serialization-library
- json-parser
- marshalling
- rpc
- +14 more
+379 stars
from 26,231 · score 5.94
6.apache / arrow
Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics
- arrow
- parquet
+331 stars
from 16,945 · score 5.81
+219 stars
from 10,712 · score 5.39
+207 stars
from 12,857 · score 5.34
9.ijl / orjson
Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy
- json
- python
- rust
- serialization
- datetime
- pyo3
- +3 more
+124 stars
from 8,160 · score 4.83
10.capnproto / capnproto
Cap'n Proto serialization/RPC system - core tools and C++ library
+119 stars
from 13,122 · score 4.79
11.bytedance / sonic
A blazingly fast JSON serializing & deserializing library
+112 stars
from 9,538 · score 4.73
12.Tencent / rapidjson
A fast JSON parser/generator for C++ with both SAX/DOM style API
+85 stars
from 15,068 · score 4.45
13.google / gson
A Java serialization/deserialization library to convert Java Objects into JSON and back
+79 stars
from 24,158 · score 4.38
+76 stars
from 6,074 · score 4.34
15.mholt / PapaParse
Fast and powerful CSV (delimited text) parser that gracefully handles large files and malformed input
- csv
- javascript
- csv-parser
+67 stars
from 13,523 · score 4.22
16.MessagePack-CSharp / MessagePack-CSharp
Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]
+64 stars
from 6,746 · score 4.17
17.apache / thrift
Apache Thrift
+59 stars
from 10,910 · score 4.09
18.open-source-parsers / jsoncpp
A C++ library for interacting with JSON.
+57 stars
from 8,853 · score 4.06
19.bblanchon / ArduinoJson
📟 JSON library for Arduino and embedded C++. Simple and efficient.
- arduino
- c-plus-plus
- iot
- embedded
- arduino-library
- json
- +2 more
+54 stars
from 7,188 · score 4.01
20.leethomason / tinyxml2
TinyXML2 is a simple, small, efficient, C++ XML parser that can be easily integrated into other programs.
+54 stars
from 5,763 · score 4.01
+51 stars
from 15,508 · score 3.95
22.hashicorp / hcl
HCL is the HashiCorp configuration language.
- hcl
- configuration-language
- hashicorp
- json
+50 stars
from 5,781 · score 3.93
23.JamesNK / Newtonsoft.Json
Json.NET is a popular high-performance JSON framework for .NET
- json
- c-sharp
+42 stars
from 11,277 · score 3.76
24.protobufjs / protobuf.js
High-performance Protocol Buffers for JavaScript and TypeScript. Conformant through Edition 2026, and unusually versatile. No protoc required.
- javascript
- typescript
- protobuf
- protocol-buffers
+42 stars
from 10,563 · score 3.76
+39 stars
from 10,130 · score 3.69
+35 stars
from 6,606 · score 3.58
27.SwiftyJSON / SwiftyJSON
The better way to deal with JSON data in Swift.
- swiftyjson
- json
- swift
- response
- request
- carthage
- +4 more
+27 stars
from 22,895 · score 3.33
28.EsotericSoftware / kryo
Java binary serialization and cloning: fast, efficient, automatic
- java
- serialization
- cloning
- kryo
+24 stars
from 6,524 · score 3.22
29.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
- serialization
- deserialization
- validation
- python
- marshalling
- serde
- +1 more
+20 stars
from 7,224 · score 3.04
30.sindresorhus / query-string
Parse and stringify URL query strings
- query-string
- urlsearchparams
- url
- stringify
- parse
- npm-package
+19 stars
from 6,895 · score 3.00
31.martinblech / xmltodict
Python module that makes working with XML feel like you are working with JSON
+18 stars
from 5,741 · score 2.94
+16 stars
from 10,057 · score 2.83
+10 stars
from 1,318 · score 2.40
34.alibaba / fastjsonArchived
FASTJSON 2.0.x has been released, faster and more secure, recommend you upgrade.
- fastjson
- java
- android
- json
- json-parser
- json-serialization
- +4 more
+8 stars
from 25,553 · score 2.20
+6 stars
from 11,231 · score 1.95
36.CoderMJLee / MJExtension
A fast, convenient and nonintrusive conversion framework between JSON and model. Your model class doesn't need to extend any base class. You don't need to modify any model file.
- objective-c
- model
- json
- dictionary
- array
+5 stars
from 8,477 · score 1.79
37.json-iterator / goArchived
A high-performance 100% compatible drop-in replacement of "encoding/json"
- go
- golang
- parser
- json-parser
- json
- serialization
- +2 more
+4 stars
from 13,849 · score 1.61
+4 stars
from 8,708 · score 1.61
+4 stars
from 6,166 · score 1.61
40.jsonmodel / jsonmodel
Magical Data Modeling Framework for JSON - allows rapid creation of smart data models. You can use it in your iOS, macOS, watchOS and tvOS apps.
+1 stars
from 6,798 · score 0.69