Jackson is a multi-purpose Java library for processing JSON data format. This project contains core low-level incremental ("streaming") parser and generator abstractions used by Jackson Data Processor. It also includes the default implementation of handler types (parser, generator) that handle JSON format. 

Jackson JSON - JSON Parser in Java

 jsmn (pronounced like 'jasmine') is a minimalistic JSON parser in C. It can be easily integrated into resource-limited or embedded projects. Most JSON parsers offer you a bunch of functions to load JSON data, parse it and extract any value by its name. jsmn proves that checking the correctness of every JSON packet or allocating temporary objects to store parsed JSON fields often is an overkill.
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jsmn is designed to be robust (it should work fine even with erroneous data), fast (it should parse data on the fly), portable (no superfluous dependencies or non-standard C extensions). And of course, simplicity is a key feature - simple code style, simple algorithm, simple integration into other projects.

jsmn (pronounced like 'jasmine') is a minimalistic JSON parser in C. It can be easily integrated into resource-limited or embedded projects. Most JSON parsers offer you a bunch of functions to load JSON data, parse it and extract any value by its name. jsmn proves that checking the correctness of every JSON packet or allocating temporary objects to store parsed JSON fields often is an overkill.

Jsmn - World fastest JSON parser/tokenizer

Jackson is one of best JSON parser for Java. More than that, Jackson is a suite of data-processing tools for Java (and the JVM platform), including the flagship streaming JSON parser / generator library, matching data-binding library (POJOs to and from JSON) and additional data format modules to process data encoded in Avro, BSON, CBOR, CSV, Smile, (Java) Properties, Protobuf, XML or YAML; and even the large set of data format modules to support data types of widely used data types such as Guava, Joda, PCollections and many, many more.

Jackson - Best JSON parser for Java

RapidJSON is a JSON parser and generator for C++. RapidJSON is small but complete. It supports both SAX and DOM style API. RapidJSON is self-contained and header-only. It does not depend on external libraries such as BOOST. It even does not depend on STL.

RapidJSON - A fast JSON parser/generator for C++ with both SAX/DOM style API

A Java DSL for reading JSON documents.Jayway JsonPath is a Java port of Stefan Goessner JsonPath implementation. JsonPath expressions always refer to a JSON structure in the same way as XPath expression are used in combination with an XML document. The "root member object" in JsonPath is always referred to as $ regardless if it is an object or array.

JsonPath - Java JsonPath implementation

Oboe.js is an open source Javascript library for loading JSON using streaming, combining the convenience of DOM with the speed and fluidity of SAX. It can parse any JSON as a stream, is small enough to be a micro-library, doesn't have dependencies, and doesn't care which other libraries you need it to speak to.

oboe.js - A streaming approach to JSON. 

JsonFx v2.0 - JSON serialization framework for .NET. It has unified interface for reading / writing JSON, BSON, XML, JsonML. It implements LINQ-to-JSON, Supports reading/writing using DataContract, XmlSerialization, JsonName, attributes and lot more.

JsonFx.NET - JSON serialization framework for .NET

HandyJSON is a framework written in Swift which to make converting model objects( pure classes/structs ) to and from JSON easy on iOS.Compared with others, the most significant feature of HandyJSON is that it does not require the objects inherit from NSObject(not using KVC but reflection), neither implements a 'mapping' function(writing value to memory directly to achieve property assignment).

HandyJSON - A handy swift json-object serialization/deserialization library

Jodd is developer-friendly set of Java microframeworks, tools and utilities, under 1.7 MB. Build with common sense to make things simple, but not simpler. Its feature include slick IoC container, elegant MVC framework, unique AOP engine, thin DB-object mapper, standalone transaction manager, focused validation tool, versatile HTML parsers, pages decorator, super properties, powerful BeanUtil, timeless JDateTime, easy email, many super utilities... and more. <BR><BR>
Tools and utilities: 
<ul>
<li><code>jodd-core</code> contains many utilities, including <code>JDateTime</code>.</li>
<li><code>jodd-bean</code>, our infamous <code>BeanUtil</code>, type inspectors and converters.</li>
<li><code>jodd-props</code> is the super-replacement for Java <code>Properties</code>.</li>
<li><code>jodd-mail</code> for easier email sending.</li>
<li><code>jodd-upload</code>, handles HTTP uploads.</li>
<li><code>jodd-servlet</code> with many servlet utilities, including nice tag library.</li>
<li><code>jodd-http</code>, tiny HTTP client.</li>
</ul>
Micro-frameworks:

<ul>
<li><code>jodd-madvoc</code> - slick MVC framework.</li>
<li><code>jodd-petite</code> - pragmatic DI container.</li>
<li><code>jodd-lagarto</code> - HTML parser with <code>Jerry</code> and <code>CSSelly</code>.</li>
<li><code>jodd-decora</code> - pages decorator.</li>
<li><code>jodd-htmlstapler</code> - static page resources handler.</li>
<li><code>jodd-proxetta</code> - dynamic proxies and <code>Paramo</code>.</li>
<li><code>jodd-db</code> - thin database layer and object mapper.</li>
<li><code>jodd-json</code> - JSON parser and serializer.</li>
<li><code>jodd-vtor</code> - validation framework.</li>
<li><code>jodd-jtx</code> - transactions management.</li>
</ul>

Jodd is developer-friendly set of Java microframeworks, tools and utilities, under 1.7 MB. Build with common sense to make things simple, but not simpler. Its feature include slick IoC container, elegant MVC framework, unique AOP engine, thin DB-object mapper, standalone transaction manager, focused validation tool, versatile HTML parsers, pages decorator, super properties, powerful BeanUtil, timeless JDateTime, easy email, many super utilities... and more. 

Jodd - The Unbearable Lightness of Java

json11 is a tiny JSON library for C++11, providing JSON parsing and serialization.The core object provided by the library is json11::Json. A Json object represents any JSON value: null, bool, number (int or double), string (std::string), array (std::vector), or object (std::map).

json11 - A tiny JSON library for C++11.

The simdjson library uses commonly available SIMD instructions and microparallel algorithms to parse JSON 4x faster than RapidJSON and 25x faster than JSON for Modern C++. It takes advantage of modern microarchitectures, parallelizing with SIMD vector instructions, reducing branch misprediction, and reducing data dependency to take advantage of each CPU's multiple execution cores.

Simdjson - Parsing gigabytes of JSON per second 

ServiceStack.Text is an independent, dependency-free serialization library that contains ServiceStack's text processing functionality, including: JsonSerializer, TypeSerializer (JSV-Format), CsvSerializer, T.Dump extension method, StringExtensions - Xml/Json/Csv/Url encoding, BaseConvert, Rot13, Hex escape, etc.,     Stream, Reflection, List, DateTime, etc extensions and utils.


ServiceStack text - NET's fastest JSON, JSV and CSV Text Serializers

A reference implementation of a JSON package in Java. The files in this package implement JSON encoders/decoders in Java. It also includes the capability to convert between JSON and XML, HTTP headers, Cookies, and CDL.

JSON-java - A reference implementation of a JSON package in Java

Jil is a fast JSON (de)serializer, built on Sigil with a number of somewhat crazy optimization tricks.

Jil -  Fast .NET JSON (De)Serializer, Built On Sigil

Json.NET is a popular high-performance JSON framework for .NET. It is serializes .NET objects to JSON. It converts JSON to LINQ, XML and lot more. It performs faster than .NET buit in serializers.

JSON.NET - JSON framework for .NET

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