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JavaScript Object Notation.

JAON is a format for exchanging data between systems. It is a text based format (and so human readable), and uses simple data structures and associative arrays.

It has been suggested that JSON is more efficient (although perhaps less versatile) than XML. Since both file types require some processing, which is the most suitable or the most efficient should be considered on a per application basis. JSON files require less processing to parse than XML files, and for some applications can be smaller than the XML equivalents. JSON is supported natively by JavaScript and for JavaScript based solutions JSON is therefore a very efficient means of data exchange.

JSON files normally use the .json file extension.

The MIME media type for JSON is application/json.

For more information see: