simple utility function to convert XML to JSON using TreeWalker

XML2JSON.js

    function XML2JSON(doc) {

        function workhorse(tw) {
            var curNode = tw.currentNode;

            if (curNode.nodeType === 3) {
                return curNode.nodeValue;
            }

            var obj = {}

            if (!!curNode.attributes) {
                for (var x = 0; x < curNode.attributes.length; x++) {
                    var a = curNode.attributes.item(x);
                    obj["$" + a.nodeName] = a.nodeValue;
                }
            }

            var child = tw.firstChild();
            var backup = child !== null;
            while (!!child) {
                var name = child.nodeName;
                var value = workhorse(tw);

                if (!obj[name]) {
                    obj[name] = value;
                } else if (Array.isArray(obj[name])) {
                    obj[name].push(value);
                } else {
                    var temp = obj[name];
                    obj[name] = [temp, value];
                }

                child = tw.nextSibling();
            }

            if (backup) { tw.parentNode(); }

            return obj;
        }

        var tw = document.createTreeWalker(doc, NodeFilter.SHOW_ELEMENT + NodeFilter.SHOW_TEXT, function (node) {
            if (node.nodeType === 3 && node.nodeValue.trim().length === 0) {
                return NodeFilter.FILTER_SKIP;
            }
            return NodeFilter.FILTER_ACCEPT;
        }, false);

        return workhorse(tw);
    }