Jason is a JSON viewer & editor for Mac OS X. It can open local documents as well as download JSON data via HTTP and, in case of invalid data, an error message is presented and the line containing the error is highlighted.

command-line utils for working with JSON

UnQL means Unstructured Query Language. It's an open query language for JSON, semi-structured and document databases.

"Fields for storing serializable data." Includes field types for JSON and Python's Pickle format.

Always suspected that JSONP was a cause of some memory leaks I've encountered.

"JSONView is a Firefox extension that helps you view JSON documents in the browser."

xpath for json.

"With the number of publicly offered Web service APIs, it's now much easier to get content from different Web sources and to build mashups—if you have access to the right APIs and tools. Discover how you can combine an obscure cross-domain call technique (JSONP) and a flexible JavaScript library (jQuery) to build powerful mashups surprisingly quickly."

"JsonML (JSON Markup Language) is an application of the JSON (JavaScript Object Notation) data-interchange format. The purpose of JsonML is to provide a compact format for transporting XML-based data via JSON."

"XMLHttpRequest has a security model which is inadequate for supporting the next generation of web applications. JSONRequest is proposed as a new browser service that allows for two-way data exchange with any JSON data server without exposing users or organization to harm. It exchanges data between scripts on pages with JSON servers in the web. It is hoped that browser makers will build this feature into their products in order to enable the next advance in web application development."

"XMLHttpRequest has a security model which is inadequate for supporting the next generation of web applications. JSONRequest is proposed as a new browser service that allows for two-way data exchange with any JSON data server without exposing users or organization to harm. It exchanges data between scripts on pages with JSON servers in the web. It is hoped that browser makers will build this feature into their products in order to enable the next advance in web application development."

Effective use of YUI, JSON, XHR, etc.

"JavaScript Object Notation (JSON) is a lightweight, text-based, language-independent data interchange format. It was derived from the ECMAScript Programming Language Standard. JSON defines a small set of formatting rules for the portable representation of structured data."

"JSON (and JSON-P) wrapper around the TinyURL API"

"Comparing different JSON implementations and thier compliance with RFC 4627"

json time service

"E4X is an extension to JavaScript that is available to both Firefox and ActionScript developers that turns XML into a native data type on par with strings, arrays, objects, and regular expressions."

a lightweight database abstraction layer suitable for high-load websites where you need the scalable advantages of connection pooling.

"Optimus, the microformats transformer. Easily transform your microformatted content to nice, clean, easily digestible, XML, JSON or JSON-P. You can also easily set filters to only receive particular formats."

Exhibit is a lightweight structured data publishing framework that lets you create web pages with support for sorting, filtering, and rich visualizations by writing only HTML and optionally some CSS and Javascript code.