I have a node server and an application from another server doing a AJAX jsonp request via jquery to get a json array of parameters, but when i request the data the jquery throws this error:

Uncaught TypeError: Cannot read property 'toLowerCase' of undefined 

The request is sent and i get the response, but i can't get the data in the javascript client-side

Node server:

var my_http = require('http');





var databaseUrl = leitordecarga; // username:[email protected]/mydb

var collections = [tables]

var db = require(mongojs).connect(databaseUrl, collections);



var callback = [];

db.tables.find(function(err,values){

    if(err || !values){

        console.log('error');

    }else{

        values.forEach(function(value){

            callback.push(value);

        });

    }

});





my_http = require(http);  

my_http.createServer(function(request,response){  

    response.writeHeader(200, {Content-Type: application/json});  

    response.write(JSON.stringify(callback));  

    response.end();  

}).listen(8080); 

Javascript in client-side:

$(document).ready(function(){

    $.ajax({

        url:'http://localhost:8080/mongo.js',

        dataType:'jsonp',

        type: GET,

        jsonp : callback,

        contentType: application/jsonp,

        success: function(data){

            console.log(data);

        },

        error: function(data){

            console.log(data.getResponseHeader());

        }

    }).done(function( data ) {

        console.log(data);

    });

}); 

im using jquery 2.1.0 but i've tried other versions and the error persists

My question is how i can get the data in the success clause