http://zorba.io/modules/json-xml

Using this module, you can parse JSON data into XML, manipulate it like any other XML data using XQuery, and serialize the result back as JSON.

There are many ways to represent JSON data in XML, some loss-less ("round tripable") and some lossy ("one way"). Loss-less representations preserve the JSON data types boolean, number, and null; lossy representations convert all data to strings.

For a loss-less representation, this module implements that proposed by John Snelson. For example:

   {
     "firstName" : "John",
     "lastName" : "Smith",
     "address" : {
       "streetAddress" : "21 2nd Street",
       "city" : "New York",
       "state" : "NY",
       "postalCode" : 10021
     },
     "phoneNumbers" : [ "212 732-1234", "646 123-4567" ]
   }
 

would be represented as:

   <json type="object">
     <pair name="firstName" type="string">John</pair>
     <pair name="lastName" type="string">Smith</pair>
     <pair name="address" type="object">
       <pair name="streetAddress" type="string">21 2nd Street</pair>
       <pair name="city" type="string">New York</pair>
       <pair name="state" type="string">NY</pair>
       <pair name="postalCode" type="number">10021</pair>
     </pair>
     <pair name="phoneNumbers" type="array">
       <item type="string">212 732-1234</item>
       <item type="string">646 123-4567</item>
     </pair>
   </json>
 

For a lossy representation, this module implements JsonML (the array form). For example:

   [ "person",
     { "created" : "2006-11-11T19:23",
       "modified" : "2006-12-31T23:59" },
     [ "firstName", "Robert" ],
     [ "lastName", "Smith" ],
     [ "address",
       { "type" : "home" },
       [ "street", "12345 Sixth Ave" ],
       [ "city", "Anytown" ],
       [ "state", "CA" ],
       [ "postalCode", "98765-4321" ]
     ]
   ]
 

would be represented as:

   <person created="2006-11-11T19:23" modified="2006-12-31T23:59">
     <firstName>Robert</firstName>
     <lastName>Smith</lastName>
     <address type="home">
       <street>12345 Sixth Ave</street>
       <city>Anytown</city>
       <state>CA</state>
       <postalCode>98765-4321</postalCode>
     </address>
   </person>
 

declare  function jx:json-to-xml($json as json-item()?) as element(*,xs:untyped)?

declare  function jx:json-to-xml($json as json-item()?, $options as object()) as element(*,xs:untyped)?

declare  function jx:xml-to-json($xml as item()*) as json-item()*

declare  function jx:xml-to-json($xml as item()*, $options as object()) as json-item()*