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Daniel K. Schneider at 16:40, 9 July 2009

2009-07-09T16:40:57Z

New page

== Definition ==

{{quotation | JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999. JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language.}} ([http://www.json.org/ JSON], retrieved 19:07, 15 May 2007 (MEST)).

{{quotation | '''JSON''' (JavaScript Object Notation) is a lightweight computer data interchange format. It is a text-based, human-readable format for representing objects and other data structures and is mainly used to transmit such structured data over a network connection (in a process called serialization). JSON finds its main application in [[AJAX]] web application programming, as a simple alternative to using XML for asynchronously transmitting structured information between client and server.}} ([http://en.wikipedia.org/wiki/JSON], retrieved 19:07, 15 May 2007 (MEST))

== Technology ==

* JSON is one of the rare modern data-interchange formats that is '''not''' XML.
JSON is a subset of the object literal notation of JavaScript. Since JSON is a subset of JavaScript, it can be used in the language with no muss or fuss.

{{quotationbox|JSON supports several data types including:
* number (integer, real, or floating point)
* String (double-quoted Unicode with backslash escapement)
* boolean (true and false)
* Array (an ordered sequence of values, comma-separated and enclosed in square brackets)
* Object (collection of key/value pairs, comma-separated and enclosed in curly brackets)
* null ([http://www.webreference.com/programming/javascript/rg5/index.html Rob Gravell], retr. feb 2008)}}

{
"anInt": 5555,
"aFloat": 55.055,
"aString": "testing",
"aBoolean": true,
"anArray": [1, "2", 3.34, "dog"],
"anObject": {
"prop1": "a value",
"prop2": "another value",
"prop3": -9999
},
"aNull": null
}

JSON is built on two structures (JSON website, retr. May 2007):
* A collection of name/value pairs. In various languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
* An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.

var myJSONObject = {"bindings": [
{"ircEvent": "PRIVMSG", "method": "newURI", "regex": "^http://.*"},
{"ircEvent": "PRIVMSG", "method": "deleteURI", "regex": "^delete.*"},
{"ircEvent": "PRIVMSG", "method": "randomURI", "regex": "^random.*"}
]
};

In this example, an object is created containing a single member "bindings", which contains an array containing three objects, each containing "ircEvent", "method", and "regex" members.

Members can be retrieved using dot or subscript operators.

myJSONObject.bindings[0].method // "newURI"

== Links ==

; Official
* [http://www.json.org/ JSON HomePage]
* [http://tools.ietf.org/html/rfc4627 RFC 4627] JSON specification

; Tutorials and Overviews
* [http://en.wikipedia.org/wiki/JSON JSON Wikipedia page]
* [http://www.webreference.com/programming/javascript/rg5/index.html An Introduction to JavaScript Object Notation (JSON)] by Bob Gravelle, 2008.

[[Category: XML]]

[[Category: Rich internet applications]]
[[Category:JavaScript]]

JSON - Revision history

Daniel K. Schneider: Text replacement - "$" to " {{edutechwiki}}"

Daniel K. Schneider: 1 revision imported

Daniel K. Schneider at 16:40, 9 July 2009