hitting a multipart url in nodejs

I have a client code using form-data module to hit a url that returns a content-type of image/jpeg. Below is my code

var FormData = require('form-data');
var fs = require('fs');

var form = new FormData();
//form.append('POLICE', "hello");
//form.append('PAYSLIP', fs.createReadStream("./Desert.jpg"));

console.log(form);
//http://ift.tt/1FVDUD7  1/c8.0.50.50/p50x50/10934065_1389946604648669_2362155902065290483_n.jpg?oh=13640f19512fc3686063a4703494c6c1&oe=55ADC7C8&__gda__=1436921313_bf58cbf91270adcd7b29241838f7d01a
form.submit({
    protocol: 'https:',
    host: 'fbcdn-profile-a.akamaihd.net',
    path: '/hprofile-ak-xfp1/v/t1.0-1/c8.0.50.50/p50x50/10934065_1389946604648669_2362155902065290483_n.jpg?oh=13640f19512fc3686063a3494c6c1&oe=55ADCC8&__gda__=1436921313_bf58cbf91270adcd7b2924183',
    method: 'get'
}, function (err, res) {
    var data = "";
    res.on("data", function (chunks) {
        data += chunks;
    });
    res.on("end", function () {
        console.log(data);
        console.log("Response Headers - " + JSON.stringify(res.headers));
    });
});

I'm getting some chunk data and the response headers i received was

{"last-modified":"Thu, 12 Feb 2015 09:49:26 GMT","content-type":"image/jpeg","timing-allow-origin":"*","access-control-allow-origin":"*","content-length":"1443","cache-control":"no-transform, max-age=1209600","expires":"Thu, 30 Apr 2015 07:05:31 GMT","date":"Thu, 16 Apr 2015 07:05:31 GMT","connection":"keep-alive"}

I am now stuck as how to process the response that i received to a proper image.I tried base64 decoding but it seemed to be a wrong approach any help will be much appreciated.