server.js

sys     = require('system')

var server, service;

server = require('webserver').create();

function getParameterByName(name, url) {
  name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
  var regexS = "[\\?&]" + name + "=([^&#]*)";
  var regex = new RegExp(regexS);
  var results = regex.exec("?" + url.split("?")[1]);

  if(results == null)
    return "";
  else
    return decodeURIComponent(results[1].replace(/\+/g, " "));
}

service = server.listen(sys.args[1], function (request, response) {

    (function(){

      var page = require('webpage').create();
      
      var page_url = getParameterByName('url', request.url);
      var callback_func = getParameterByName('callback', request.url);
      
      if ( page_url != null && page_url != "" ) {

        page.open(page_url, function (status) {

          page.injectJs("add.js");

          var itemData = page.evaluate(function () {
              return window.itemData;
          });  

          response.statusCode = 200;

          var out_itemData = {};

          out_itemData.title = itemData.title;
          if ( itemData.price != null && itemData.price.length > 1 ) {
            out_itemData.price = parseFloat(itemData.price.slice(1).replace(/,/g, '')); // remove $
          }
          out_itemData.images = [];
          for ( var i in itemData.imageArray ) {
            console.log(JSON.stringify(itemData.imageArray[i]));
            out_itemData.images.push(itemData.imageArray[i].src);
          }

          console.log(JSON.stringify(itemData));
          output_json = JSON.stringify(out_itemData);

          if ( callback_func != null && callback_func != "" ) {
            output_json = callback_func + "(" + output_json + ");"
          }

          response.write(output_json);
          response.close();
          
          //page.release();

          page.close();

        });

      }
      else
      {

        response.statusCode = 500;
        response.write("No URL Provided");
        response.close();

        page.close();

      }
    
    })();

});