JSON to XML

function createXML(json, rootName) {
	var doc = document.implementation.createDocument(null, null, null);
  var rootNode = doc.createElement(rootName);
  var xml = createXMLRecursive(doc, rootNode, json);
	return doc.appendChild(xml);
}

function createXMLRecursive(doc, node, json) {
	for (var literal in json) {
		// for string literals
		if (typeof json[literal] === 'string' && literal !== '$class') {
			var innerNode = doc.createElement(literal);
			var text = doc.createTextNode(json[literal]);
			innerNode.appendChild(text);
			node.appendChild(innerNode);
		}
		// for arrays
		else if (Object.prototype.toString.call(json[literal]) === '[object Array]') {
			var nodeList = doc.createElement(literal);
			for (var i = 0; i < json[literal].length; i++) {
				// get the class name
				if (typeof json[literal][i] == 'object' && json[literal][i].hasOwnProperty('$class')) {
					var className = json[literal][i]['$class'];
				}
				else {
					var className = i;
				}
				// create node
				var innerNode = doc.createElement(className);
				node.appendChild(createXMLRecursive(doc, innerNode, json[literal][i]));
				// add node
				nodeList.appendChild(innerNode);
			}
			node.appendChild(nodeList);
		}
		// for objects
		else if (typeof json[literal] === 'object') {
			createXMLRecursive(doc, node, json[literal]);
		}
	}
  return node;
}

var obj = {
  "testxml": {
    "name": "Brian",
    "job": "Developer",
    "david": [
      {
        "$class": "ClassA",
        "name": "David",
        "job": "Developer"
      }
    ],
    "chickenList": [
      {
        "$class": "ClassB",
        "chicken": "thigh",
        "made": "made in canada"
      },
      {
        "$class": "ClassB",
        "chicken": "thigh",
        "made": "made in canada"
      }
    ],
    "$class": "ClassA"
  }
}

/*
var obj = {
	root: {
		prop1: {
			child: "text1",
			child2: "text2",
			childobj: [{
				childobj1: "childobj1",
				childobj2: "childobj2"
			}]
		},
		prop2: {
			child3: "text3",
			child4: "text4"
		}
	}  	
};
*/

console.log(new XMLSerializer().serializeToString(createXML(obj, 'testxml')));