1.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
+1,771 stars
from 23,835 · score 7.48
Trending repositories
Ranked by Attention Score: stars gained over the last 180 complete days
56 repositories by Attention Score · May 8, 2026 – Nov 3, 2026 (UTC)
+1,621 stars
from 49,217 · score 7.39
3.protocolbuffers / protobuf
Protocol Buffers - Google's data interchange format
- protobuf
- protocol-buffers
- protocol-compiler
- protobuf-runtime
- protoc
- serialization
- +2 more
+1,311 stars
from 70,839 · score 7.18
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
+898 stars
from 23,602 · score 6.80
5.google / flatbuffers
FlatBuffers: Memory Efficient Serialization Library
- flatbuffers
- serialization
- serialization-library
- json-parser
- marshalling
- rpc
- +14 more
+849 stars
from 25,761 · score 6.75
6.apache / arrow
Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics
- arrow
- parquet
+641 stars
from 16,635 · score 6.46
+471 stars
from 12,593 · score 6.16
+437 stars
from 10,494 · score 6.08
9.bytedance / sonic
A blazingly fast JSON serializing & deserializing library
+335 stars
from 9,315 · score 5.82
10.apache / fory
A blazingly fast multi-language serialization framework for idiomatic domain objects, schema IDL, and cross-language data exchange.
- cross-language
- fast
- jit
- multiple-language
- serialization
- zero-copy
- +14 more
+292 stars
from 4,286 · score 5.68
11.ijl / orjson
Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy
- json
- python
- rust
- serialization
- datetime
- pyo3
- +3 more
+287 stars
from 7,997 · score 5.66
+272 stars
from 5,878 · score 5.61
13.capnproto / capnproto
Cap'n Proto serialization/RPC system - core tools and C++ library
+270 stars
from 12,971 · score 5.60
+256 stars
from 5,346 · score 5.55
15.google / gson
A Java serialization/deserialization library to convert Java Objects into JSON and back
+198 stars
from 24,039 · score 5.29
16.MessagePack-CSharp / MessagePack-CSharp
Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]
+182 stars
from 6,628 · score 5.21
17.Tencent / rapidjson
A fast JSON parser/generator for C++ with both SAX/DOM style API
+179 stars
from 14,974 · score 5.19
18.mholt / PapaParse
Fast and powerful CSV (delimited text) parser that gracefully handles large files and malformed input
- csv
- javascript
- csv-parser
+178 stars
from 13,412 · score 5.19
+160 stars
from 15,399 · score 5.08
20.open-source-parsers / jsoncpp
A C++ library for interacting with JSON.
+126 stars
from 8,784 · score 4.84
21.bblanchon / ArduinoJson
📟 JSON library for Arduino and embedded C++. Simple and efficient.
- arduino
- c-plus-plus
- iot
- embedded
- arduino-library
- json
- +2 more
+120 stars
from 7,122 · score 4.80
22.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
+115 stars
from 10,490 · score 4.75
23.hashicorp / hcl
HCL is the HashiCorp configuration language.
- hcl
- configuration-language
- hashicorp
- json
+110 stars
from 5,721 · score 4.71
+110 stars
from 4,918 · score 4.71
25.apache / thrift
Apache Thrift
+106 stars
from 10,863 · score 4.67
26.leethomason / tinyxml2
TinyXML2 is a simple, small, efficient, C++ XML parser that can be easily integrated into other programs.
+106 stars
from 5,711 · score 4.67
27.JamesNK / Newtonsoft.Json
Json.NET is a popular high-performance JSON framework for .NET
- json
- c-sharp
+104 stars
from 11,215 · score 4.65
+93 stars
from 6,548 · score 4.54
+87 stars
from 10,082 · score 4.48
30.apple / swift-protobuf
Plugin and runtime library for using protobuf with Swift
+80 stars
from 4,890 · score 4.39
31.SwiftyJSON / SwiftyJSON
The better way to deal with JSON data in Swift.
- swiftyjson
- json
- swift
- response
- request
- carthage
- +4 more
+71 stars
from 22,851 · score 4.28
+70 stars
from 4,642 · score 4.26
33.EsotericSoftware / kryo
Java binary serialization and cloning: fast, efficient, automatic
- java
- serialization
- cloning
- kryo
+65 stars
from 6,483 · score 4.19
+55 stars
from 5,160 · score 4.03
35.protobuf-net / protobuf-net
Protocol Buffers library for idiomatic .NET
+51 stars
from 4,924 · score 3.95
+50 stars
from 10,023 · score 3.93
37.square / wire
gRPC and protocol buffers for Android, Kotlin, Swift and Java.
+44 stars
from 4,396 · score 3.81
38.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
- serialization
- deserialization
- validation
- python
- marshalling
- serde
- +1 more
+43 stars
from 7,201 · score 3.78
39.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
+39 stars
from 25,522 · score 3.69
40.sindresorhus / query-string
Parse and stringify URL query strings
- query-string
- urlsearchparams
- url
- stringify
- parse
- npm-package
+36 stars
from 6,878 · score 3.61
41.martinblech / xmltodict
Python module that makes working with XML feel like you are working with JSON
+36 stars
from 5,723 · score 3.61
42.ultrajson / ultrajson
Ultra fast JSON decoder and encoder written in C with Python bindings
- python
- c
- ultrajson
- json
- decoder
- encoder
- +1 more
+32 stars
from 4,468 · score 3.50
43.stleary / JSON-java
A reference implementation of a JSON package in Java.
- hacktoberfest
- java
- json
- public-domain
+30 stars
from 4,694 · score 3.43
44.json-iterator / goArchived
A high-performance 100% compatible drop-in replacement of "encoding/json"
- go
- golang
- parser
- json-parser
- json
- serialization
- +2 more
+27 stars
from 13,826 · score 3.33
+27 stars
from 1,301 · score 3.33
46.jazzband / tablib
Python Module for Tabular Datasets in XLS, CSV, JSON, YAML, &c.
+23 stars
from 4,735 · score 3.18
47.rails-api / active_model_serializers
ActiveModel::Serializer implementation and Rails hooks
- ruby
- json
- resource-serializer
+20 stars
from 5,321 · score 3.04
48.rails / jbuilder
Jbuilder: generate JSON objects with a Builder-style DSL
+16 stars
from 4,403 · score 2.83
+13 stars
from 11,224 · score 2.64
+11 stars
from 8,701 · score 2.48
51.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
+10 stars
from 8,472 · score 2.40
52.Leonidas-from-XIV / node-xml2js
XML to JavaScript object converter.
- coffeescript
- parsing
- xml-parser
- xml
- xml2json
- xml2js
- +4 more
+9 stars
from 4,951 · score 2.30
53.tristanhimmelman / ObjectMapper
Simple JSON Object mapping written in Swift
+6 stars
from 9,116 · score 1.95
+6 stars
from 6,164 · score 1.95
55.jimhigson / oboe.js
A streaming approach to JSON. Oboe.js speeds up web applications by providing parsed objects before the response completes.
+5 stars
from 4,811 · score 1.79
56.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