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| '''Summary'''
|Serializes the node specified by {{Code|$input}} as JSON, and returns the result as {{Code|xs:string}} instance. The serialized node must conform to the syntax specified by the [[#json:parse|json:parse()]] function.<br />XML documents can also be serialized as JSON if the [[Serialization|Serialization Option]] {{Code|"method"}} is set to {{Code|"json"}}.<br/>The {{Code|$options}} argument can be used to control the way the input is serialized. The following options are available (they bear resemblance to the ones specified in [http://www.w3.org/TR/xslt-30/#json XSLT 3.0]):
* {{Code|spec}} determines the used JSON specification. Allowed values are {{Code|RFC4627}}, {{Code|ECMA-262}}, and {{Code|liberal}}; the default is ({{Code|RFC4627}}).
* {{Code|unescape}} determines whether escape sequences (marked by a backslash) in the input are expanded. The default is {{Code|true}}.
