Download Ajax response as zip file?

I am trying to download multiple images as a zip file. As I am using Azure blob, first I listed all blobs then compressed it using Archiver and used pipe function to send it to the client. But I am getting zip as a raw file and it is not downloading. I am using Node js + Express.
Server-side script:

    function zipURLs(urls, outStream) {
  var zipArchive = archiver.create('zip');

  async.eachLimit(urls, 3, function(url, done) {
    console.log(url);
    var stream = request.get(url);

    stream.on('error', function(err) {
      return done(err);
    }).on('end', function() {
      return done();
    });

    // Use the last part of the URL as a filename within the ZIP archive.
    zipArchive.append(stream, { name : url.replace(/^.*\//, '') });
  }, function(err) {
    if (err) throw err;
    zipArchive.finalize();
    zipArchive.pipe(outStream);


  });
}
var data = {}; 
data.blob_name = value; 
console.log('downloading'); 
$.ajax({ 
    type: 'POST', 
    data: JSON.stringify(data),  
    contentType: 'application/json', 
    url: 'download/', 
    success: function(data) { console.log(data); }

Outstream is res. So I get data like this:-

enter image description here

How can I download directly as zip file using js?

Thanks

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