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
+194 stars
from 25,412 · score 5.27
Trending repositories
Ranked by Attention Score: stars gained over the last 30 complete days
1–100 of 135 by Attention Score · Oct 5, 2026 – Nov 3, 2026 (UTC)
+180 stars
from 50,658 · score 5.20
3.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
+178 stars
from 24,322 · score 5.19
4.apache / arrow
Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics
- arrow
- parquet
+116 stars
from 17,160 · score 4.76
5.protocolbuffers / protobuf
Protocol Buffers - Google's data interchange format
- protobuf
- protocol-buffers
- protocol-compiler
- protobuf-runtime
- protoc
- serialization
- +2 more
+112 stars
from 72,038 · score 4.73
+83 stars
from 10,848 · score 4.43
7.google / flatbuffers
FlatBuffers: Memory Efficient Serialization Library
- flatbuffers
- serialization
- serialization-library
- json-parser
- marshalling
- rpc
- +14 more
+79 stars
from 26,531 · score 4.38
+56 stars
from 13,008 · score 4.04
9.stephenberry / glaze
Extremely fast, in memory, serialization, reflection, and RPC library for C++. JSON, BEVE, BSON, CBOR, CSV, JSONB, MessagePack, TOML, YAML, EETF
- api
- binary
- cplusplus
- cpp
- interface
- json
- +14 more
+52 stars
from 3,045 · score 3.97
10.ijl / orjson
Fast, correct Python JSON library supporting dataclasses, datetimes, and numpy
- json
- python
- rust
- serialization
- datetime
- pyo3
- +3 more
+45 stars
from 8,239 · score 3.83
11.ibireme / yyjson
The fastest JSON library in C
- json
- c
- portable
- serialization
- deserialization
- cross-platform
- +3 more
+45 stars
from 3,892 · score 3.83
12.bytedance / sonic
A blazingly fast JSON serializing & deserializing library
+44 stars
from 9,606 · score 3.81
13.capnproto / capnproto
Cap'n Proto serialization/RPC system - core tools and C++ library
+37 stars
from 13,204 · score 3.64
+30 stars
from 5,572 · score 3.43
15.Tencent / rapidjson
A fast JSON parser/generator for C++ with both SAX/DOM style API
+28 stars
from 15,125 · score 3.37
16.google / gson
A Java serialization/deserialization library to convert Java Objects into JSON and back
+26 stars
from 24,211 · score 3.30
17.MessagePack-CSharp / MessagePack-CSharp
Extremely Fast MessagePack Serializer for C#(.NET, .NET Core, Unity, Xamarin). / msgpack.org[C#]
+26 stars
from 6,784 · score 3.30
+26 stars
from 6,124 · score 3.30
19.benhoyt / inih
Simple .INI file parser in C, good for embedded systems
- ini
- parser
- configparser
- embedded-systems
- c
+24 stars
from 3,041 · score 3.22
20.bblanchon / ArduinoJson
📟 JSON library for Arduino and embedded C++. Simple and efficient.
- arduino
- c-plus-plus
- iot
- embedded
- arduino-library
- json
- +2 more
+23 stars
from 7,219 · score 3.18
21.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
+22 stars
from 4,556 · score 3.14
22.apache / thrift
Apache Thrift
+21 stars
from 10,948 · score 3.09
23.hashicorp / hcl
HCL is the HashiCorp configuration language.
- hcl
- configuration-language
- hashicorp
- json
+20 stars
from 5,811 · score 3.04
24.marzer / tomlplusplus
Header-only TOML config file parser and serializer for C++17.
- toml
- cplusplus-17
- cplusplus-20
- header-only
- configuration-files
- cpp
- +14 more
+20 stars
from 2,160 · score 3.04
25.open-source-parsers / jsoncpp
A C++ library for interacting with JSON.
+19 stars
from 8,891 · score 3.00
26.leethomason / tinyxml2
TinyXML2 is a simple, small, efficient, C++ XML parser that can be easily integrated into other programs.
+19 stars
from 5,798 · score 3.00
27.munich-data-engineering / reflect-cpp
A C++20 library for fast serialization, deserialization and validation using reflection. Supports JSON, Avro, Boost Serialization, BSON, Cap'n Proto, CBOR, Cereal, Command line interfaces, CSV, Environment variables, flexbuffers, msgpack, parquet, TOML, UBJSON, XML, YAML, yas / msgpack.org[C++20]
+19 stars
from 1,947 · score 3.00
+18 stars
from 2,951 · score 2.94
+17 stars
from 5,011 · score 2.89
30.JamesNK / Newtonsoft.Json
Json.NET is a popular high-performance JSON framework for .NET
- json
- c-sharp
+15 stars
from 11,304 · score 2.77
31.zserge / jsmn
Jsmn is a world fastest JSON parser/tokenizer. This is the official repo replacing the old one at Bitbucket
- json-data
- json-string
- parsing
+14 stars
from 4,195 · score 2.71
+14 stars
from 1,987 · score 2.71
+13 stars
from 15,546 · score 2.64
34.mholt / PapaParse
Fast and powerful CSV (delimited text) parser that gracefully handles large files and malformed input
- csv
- javascript
- csv-parser
+13 stars
from 13,577 · score 2.64
+12 stars
from 10,157 · score 2.56
36.okuramasafumi / alba
Alba is a JSON serializer for Ruby, JRuby and TruffleRuby.
- json-serializer
- json-serialization
- ruby
- performance
- json
- presenter
- +1 more
+12 stars
from 1,203 · score 2.56
37.sindresorhus / query-string
Parse and stringify URL query strings
- query-string
- urlsearchparams
- url
- stringify
- parse
- npm-package
+11 stars
from 6,903 · score 2.48
+11 stars
from 6,630 · score 2.48
39.apple / swift-protobuf
Plugin and runtime library for using protobuf with Swift
+11 stars
from 4,959 · score 2.48
40.json-c / json-c
https://github.com/json-c/json-c is the official code repository for json-c. See the wiki for release tarballs for download. API docs at http://json-c.github.io/json-c/
- json
- c
- hacktoberfest
+11 stars
from 3,293 · score 2.48
+11 stars
from 2,863 · score 2.48
42.nschloe / meshio
:spider_web: input/output for many mesh formats
- vtk
- pypi
- python
- mesh
- mathematics
- engineering
- +1 more
+11 stars
from 2,330 · score 2.48
43.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
+10 stars
from 10,595 · score 2.40
44.aeron-io / simple-binary-encoding
Simple Binary Encoding (SBE) - High Performance Message Codec
- codec
- java
- c-plus-plus
- golang
- encoder-decoder
+10 stars
from 3,514 · score 2.40
+10 stars
from 3,301 · score 2.40
+9 stars
from 2,997 · score 2.30
47.fxamacker / cbor
CBOR codec (RFC 8949, RFC 8742) with CBOR tags, Go struct tag options (toarray, keyasint, omitempty, omitzero), float64/32/16, big.Int, and fuzz tested.
- cbor
- rfc-8949
- cose
- cwt
- go
- golang
- +7 more
+9 stars
from 1,093 · score 2.30
+8 stars
from 5,207 · score 2.20
49.stleary / JSON-java
A reference implementation of a JSON package in Java.
- hacktoberfest
- java
- json
- public-domain
+8 stars
from 4,716 · score 2.20
+8 stars
from 4,704 · score 2.20
51.square / wire
gRPC and protocol buffers for Android, Kotlin, Swift and Java.
+8 stars
from 4,432 · score 2.20
52.meta / fbthrift
Meta's Thrift implementation: cross-language serialization and high-performance async RPC
+8 stars
from 2,695 · score 2.20
+8 stars
from 1,469 · score 2.20
54.ToruNiina / toml11
TOML for Modern C++
- toml
- c-plus-plus-11
- c-plus-plus
- parser
- serializer
- c-plus-plus-14
- +4 more
+8 stars
from 1,302 · score 2.20
+7 stars
from 3,367 · score 2.08
56.jstedfast / MimeKit
A .NET MIME creation and parser library with support for S/MIME, PGP, DKIM, TNEF and Unix mbox spools.
+7 stars
from 2,003 · score 2.08
57.nietras / Sep
One of the World's Fastest .NET CSV Parsers. Modern, minimal, fast, zero allocation, reading and writing of separated values (`csv`, `tsv` etc.). Cross-platform, trimmable and AOT/NativeAOT compatible with blazing fast SIMD vectorized parsing.
- csharp
- csv
- csv-parser
- csv-reader
- csv-writer
- dotnet
- +2 more
+7 stars
from 1,475 · score 2.08
58.jpsim / Yams
A Sweet and Swifty YAML parser.
+7 stars
from 1,266 · score 2.08
+7 stars
from 1,162 · score 2.08
60.vincentlaucsb / csv-parser
A modern C++ CSV parser and serializer that doesn't make you choose between ease of use or performance.
- csv
- parser
- json
- tab-separated
- csv-parser
- statistics
- +5 more
+7 stars
from 1,130 · score 2.08
+7 stars
from 989 · score 2.08
62.marshmallow-code / marshmallow
A lightweight library for converting complex objects to and from simple Python datatypes.
- serialization
- deserialization
- validation
- python
- marshalling
- serde
- +1 more
+6 stars
from 7,238 · score 1.95
63.EsotericSoftware / kryo
Java binary serialization and cloning: fast, efficient, automatic
- java
- serialization
- cloning
- kryo
+6 stars
from 6,542 · score 1.95
64.nmdias / FeedKit
FeedKit is a Swift library for Reading and Generating RSS, Atom, and JSON feeds.
- rss
- atom
- swift
- rss-reader
- atom-feed-parser
- atom-reader
- +4 more
+6 stars
from 1,352 · score 1.95
65.protobuf-net / protobuf-net
Protocol Buffers library for idiomatic .NET
+5 stars
from 4,970 · score 1.79
66.jazzband / tablib
Python Module for Tabular Datasets in XLS, CSV, JSON, YAML, &c.
+5 stars
from 4,753 · score 1.79
67.inikulin / parse5
HTML parsing/serialization toolset for Node.js. WHATWG HTML Living Standard (aka HTML5)-compliant.
+5 stars
from 3,934 · score 1.79
68.msgpack / msgpack-c
MessagePack implementation for C and C++ / msgpack.org[C/C++]
+5 stars
from 3,350 · score 1.79
69.felixguendling / cista
Cista is a simple, high-performance, zero-copy C++ serialization & reflection library.
- serialization
- cpp
- cpp17
- reflection
- deserialization
- efficient
- +3 more
+5 stars
from 2,251 · score 1.79
+5 stars
from 2,194 · score 1.79
71.halaxa / json-machine
Efficient, easy-to-use, and fast PHP JSON stream parser
- php
- stream-processing
- json-parser
- json-iterator
- json-stream
- parsing
+5 stars
from 1,329 · score 1.79
72.eyalz800 / zpp_bits
A lightweight C++20 serialization and RPC library
- serialization
- cpp
- header-only
- rpc
- cpp20
+5 stars
from 1,008 · score 1.79
+5 stars
from 958 · score 1.79
74.FirelyTeam / firely-net-sdk
The official Firely .NET SDK for HL7 FHIR
- fhir
- dotnet-core
- dotnet
- parsing
- serialization
- validation
- +8 more
+5 stars
from 936 · score 1.79
+4 stars
from 3,224 · score 1.61
76.NaturalIntelligence / fast-xml-parser
Validate XML, Parse XML and Build XML rapidly without C/C++ based libraries and no callback.
- fast-xml-parser
- xml2json
- xml2js
- fast
- xml
- parser
- +11 more
+4 stars
from 3,135 · score 1.61
+4 stars
from 2,539 · score 1.61
+4 stars
from 2,361 · score 1.61
79.dakrone / cheshire
Clojure JSON and JSON SMILE (binary json format) encoding/decoding
+4 stars
from 1,557 · score 1.61
80.CuyZ / Valinor
Dependency free PHP library that helps to map any input into a strongly-typed structure.
+4 stars
from 1,529 · score 1.61
81.JohnSundell / Codextended
Extensions giving Swift's Codable API type inference super powers 🦸♂️🦹♀️
- swift
- codable
- json-parsing
- type-inference
+4 stars
from 1,508 · score 1.61
82.brofield / simpleini
Cross-platform C++ library providing a simple API to read and write INI-style configuration files
+4 stars
from 1,323 · score 1.61
+4 stars
from 1,076 · score 1.61
84.bytedance / sonic-cpp
A fast JSON serializing & deserializing library, accelerated by SIMD.
+4 stars
from 977 · score 1.61
85.ical4j / ical4j
A Java library for parsing and building iCalendar data models
- icalendar
- scheduling
- library
- java
+4 stars
from 837 · score 1.61
+3 stars
from 6,167 · score 1.39
87.bluelinelabs / LoganSquare
Screaming fast JSON parsing and serialization library for Android.
+3 stars
from 3,171 · score 1.39
+3 stars
from 2,226 · score 1.39
89.zfoo-project / zfoo
💡Extremely fast enterprise server framework, can be used in RPC, game server, web server.
- netty
- serialization
- game-server
- spring
- network
- websocket
- +13 more
+3 stars
from 2,010 · score 1.39
90.Masterminds / html5-php
An HTML5 parser and serializer for PHP.
- xml-namespaces
- php
- html5-parser
- dom
- domdocument
- html5-php
- +2 more
+3 stars
from 1,785 · score 1.39
+3 stars
from 1,743 · score 1.39
92.msgpack / msgpack-java
MessagePack serializer implementation for Java / msgpack.org[Java]
+3 stars
from 1,476 · score 1.39
+3 stars
from 1,266 · score 1.39
94.d99kris / rapidcsv
C++ CSV parser library
+3 stars
from 1,076 · score 1.39
95.jszwec / csvutil
csvutil provides fast and idiomatic mapping between CSV and Go (golang) values.
- golang
- csv
- fast
- csv-parser
- go
- csvutil
- +6 more
+3 stars
from 1,034 · score 1.39
+3 stars
from 998 · score 1.39
97.chronoxor / FastBinaryEncoding
Fast Binary Encoding is ultra fast and universal serialization solution for C++, C#, Go, Java, JavaScript, Kotlin, Python, Ruby, Swift
- performance
- serialization
- binary
- protocol
- low-latency
- cpp
- +9 more
+3 stars
from 960 · score 1.39
98.go-playground / form
:steam_locomotive: Decodes url.Values into Go value(s) and Encodes Go value(s) into url.Values. Dual Array and Full map support.
- decoding
- encoder
- form
- parser
- form-data
+3 stars
from 929 · score 1.39
+3 stars
from 840 · score 1.39
100.SwiftyJSON / SwiftyJSON
The better way to deal with JSON data in Swift.
- swiftyjson
- json
- swift
- response
- request
- carthage
- +4 more
+2 stars
from 22,920 · score 1.10