jsonToXMLString.js

var jsonToXMLString = function(data){                          
  var carrier = DOM.create('carrier');                
  var convert = function(data, currentNode) {
    keys(data).each(function(k) {                      
      var v = data[k];                                
      if (is_scalar(v)) {                             
        currentNode.setAttribute(k, v);               
      } else if (hasArrayNature(v)) {                 
        v.each(function(vv){                          
          var node = DOM.create(k);                   
          currentNode.appendChild(node);              
          convert(vv, node);                          
      	});                                           
      } else {                                        
        var node = DOM.create(k);                   
        currentNode.appendChild(node);              
        convert(v, node);                          
      }                                               
    });                                               
  };                                                  
  convert(data, carrier);                             
  return carrier.innerHTML;                           
};

jsonToXMLString(
    {car : 
        {color : 'red', 
         model : 'fiesta', 
          make : 'ford', 
          year : '84', 
          part : [
            {name : 'stereo', 
             status : 'missing'}, 
            {name : 'bumper', 
             status : 'rusty'}
         ]
    }
});

// "<car year="84" make="ford" model="fiesta" color="red"><part status="missing" name="stereo"></part><part status="rusty" name="bumper"></part></car>"