GJSON is a Go package that provides a fast and simple way to get values from a json document. It has features such as one line retrieval, dot notation paths, iteration.

GJSON - JSON Parser for Go

Apache Johnzon is a project providing an implementation of JsonProcessing (aka JSR-353) and a set of useful extension for this specification like an Object mapper, some JAX-RS providers and a WebSocket module provides a basic integration with Java WebSocket API (JSR-356).

Apache Johnzon - JSON Parser

Flexjson is a lightweight library for serializing Java objects into JSON. What's different about Flexjson is it's control over what gets serialized allowing both deep and shallow copies of objects.
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Most JSON serializers mimic object serialization libraries and try to serialize the entire object graph from the object being turned into JSON. This causes problems when you want a connected object model in your server, but you can't send that object model to the client because the serialization library will try to send the entire object graph. This makes it very hard to create object oriented models and serialize pieces of that model to the client without sending everything. Other JSON libraries require you to create a lot of boiler plate code to translate your object representation into a JSON object. 

Flexjson is a lightweight library for serializing Java objects into JSON. What's different about Flexjson is it's control over what gets serialized allowing both deep and shallow copies of objects.

Flexjson - Lightweight JSON parser

jq is a lightweight and flexible command-line JSON processor. jq is like sed for JSON data - you can use it to slice and filter and map and transform structured data with the same ease that sed, awk, grep and friends let you play with text.

jq - Command-line JSON processor

Moshi is a modern JSON library for Android and Java. It makes it easy to parse JSON into Java objects. It has has built-in support for reading and writing Java’s core data types like Primitives (int, float, char...), Collections, String, Enum. Moshi uses the same streaming and binding mechanisms as Gson. If you’re a Gson user you’ll find Moshi works similarly.

Moshi - A modern JSON library for Android and Java

 UltraJSON is an ultra fast JSON encoder and decoder written in pure C with bindings for Python 2.5+ and 3. For a more painless day to day C/C++ JSON decoder experience please checkout ujson4c, based on UltraJSON.

UltraJSON - Ultra fast JSON decoder and encoder written in C with Python bindings

DJSON is a JSON decoder for Go that is 2~ to 3~ times faster than the standard encoding/json and the existing solutions, when dealing with arbitrary JSON payload. It is a good approach for people who are using json.Unmarshal together with interface{}, don't know what the schema is, and still want good performance with minimal changes.

djson - Fast Go decoder for dynamic JSON

Fastjson is a Java library that can be used to convert Java Objects into their JSON representation. It can also be used to convert a JSON string to an equivalent Java object. Fastjson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.

fastjson - Fast JSON Processor

The main goal of Boon is to reduce the productivity delta between Java and Python/Groovy/Ruby. The idea is to just create a lower ceremony APIs. Less Java like APIs, and more getting things done quickly APIs. If reading a file takes one line of code in Ruby/Python/Groovy, then it will also in Java. If slice notation is part of those language, then Boon will have it to.
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Boon helps to make lists, maps, and sets feel like they are part of the core language instead of APIs. This includes mimicking map literals, list literals, and set literals.  Boon will have its own collection libs. Boon has a collection query language already. It is good alternative to Guava. 


The main goal of Boon is to reduce the productivity delta between Java and Python/Groovy/Ruby. The idea is to just create a lower ceremony APIs. Less Java like APIs, and more getting things done quickly APIs. If reading a file takes one line of code in Ruby/Python/Groovy, then it will also in Java. If slice notation is part of those language, then Boon will have it to.



Boon - Low Ceremony. High Productivity. A real boon to Java to developers!

A fast JSON parser and Object marshaller as a Ruby gem.

oj - Optimized JSON

JSONiJ is a JSON Parser, JPath Implementation and Marshaller implemented in Java. Its easy to use and it has good performance.

JSONiJ - JSON in Java

Circe is a JSON library for Scala (and Scala.js).

Circe - A JSON library for Scala

JSONSL is JSON Stateful (or Simple, or Stacked, or Searchable, or Streaming) Lexer.It is inspired by YAJL. It is Stateful, Decoupling Object Graph from Data, Callback oriented, selectively, Non Buffering, 

JSONSL - Embeddable, Fast, Streaming, Non-Buffering JSON Parser

sajson is an extremely high-performance, in-place, DOM-style JSON parser written in C++. Originally, sajson meant Single Allocation JSON, but it now supports dynamic allocation too. sajson parses an input document into a contiguous AST structure. Unlike some other high-performance JSON parsers, the AST is efficiently queryable. Object lookups by key are O(lg N) and array indexing is O(1).

sajson - Lightweight, extremely high-performance JSON parser for C++11

QJson is a qt-based library that maps JSON data to QVariant objects. JSON arrays will be mapped to QVariantList instances, while JSON's objects will be mapped to QVariantMap.

 QJson - Manage JSON objects with Qt

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