A simple JSON to XML converter with namespace support.

json2xml.js

json2xml = function(o, ns, tab) {
	if (!Array.prototype.j) Array.prototype.j = function (a) { return this.join(a||"") };
	var ns = ns+":"||"", m, xml = '',
		toXml = function(v, name, ind) {
			var i, n, m, s, hasChild, xml = "";
			
			if (v instanceof Array) {
				for (i = 0, n = v.length; i < n; i++) {
					xml += [ind,toXml(v[i], name, ind + '\t'),'\n'].j();
				}
			} else if (typeof(v) === "object") {
				hasChild = false;
				xml += [ind,'<',ns,name].j();
				
				for (m in v) {
					if (m.charAt(0) === "@") {
						s = (v[m]) ? v[m].toString() : "";
						xml += [' ',m.substr(1),'="',s,'"'].j();
					} else {
						hasChild = true;
					}
				}
				
				xml += hasChild ? '>' : ' />';
				
				if (hasChild) {
					for (m in v) {
						if (m === "#text") {
							xml += v[m];
						} else if (m === "#cdata") {
							xml += ['<![CDATA[',v[m],']]>'].j();
						} else if (m.charAt(0) !== "@") {
							xml += toXml(v[m], m, ind + '\t');
						}
					}
					
					xml += [(xml.charAt(xml.length - 1) === '\n' ? ind : ''),'</',ns,name,'>'].j();
				}
			} else {
				if (v === undefined || v === null) { console.warn("xml2json",name||"!name",ind||"!ind",xml||"!xml",v); }
				v = v === undefined ? "" : v;
				xml += [ind,'<',ns,name,'>',v.toString(),'</',ns,name,'>'].j();
			}
			
			return xml;
		};
	
	for (m in o) {
		xml += toXml(o[m], m, '');
	}
	
	return tab ? xml.replace(/\t/g, tab) : xml.replace(/\t|\n/g, '');
}