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

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.
<BR><BR>
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

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

Json-lib is a java library for transforming beans, maps, collections, java arrays and XML to JSON and back again to beans and DynaBeans. 

Json-lib -  Java library for transforming objects and collections to JSON

Noggit is the world's fastest streaming JSON parser for Java. It is used in Apache Solr.
<BR>Its features include: <BR>
<ul>
<li>Fast!  Measured as the fastest JSON parser on char[], String input.</li>
<li>Streaming API (StAX/pull-parser like) for both easy and efficient parsing.</li>
<li>Conforms to JSON standard: <a href="http://www.ietf.org/rfc/rfc4627.txt">http://www.ietf.org/rfc/rfc4627.txt</a></li>
<li>Conforms to JSON standard: <a href="http://rfc7159.net/rfc7159">http://rfc7159.net/rfc7159</a></li>
<li>Memory efficiency:
<ul>
<li>Incremental parsing (Reader-based) in order to handle huge messages.</li>
<li>A single byte of state needed per nested object or array.</li>
<li>Doesn't read large objects (including primitives) into memory unless asked.</li>
<li>Can eliminate most copying, allowing user to provide value output buffers.</li>
</ul>
</li>
<li>Can handle primitives of any size (does not attempt to parse
numerics into a certain language primitive unless asked).</li>
<li>Simple serialization of objects (List, Map, etc).</li>
<li>Optional creation of objects (List, Map, etc) when parsing.</li>
</ul>

Noggit is the world's fastest streaming JSON parser for Java. It is used in Apache Solr.

Noggit - JSON streaming parser

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

Flexjson - Lightweight JSON parser

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Json-lib - Java library for transforming objects and collections to JSON

Noggit - JSON streaming parser

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

Flexjson - Lightweight JSON parser

JSONiJ - JSON in Java

Json-lib - Java library for transforming objects and collections to JSON

Noggit - JSON streaming parser

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