Image file/files upload with multer, node and express

var data;
var xhr = new XMLHttpRequest();
var imgUri = "https://cors-anywhere.herokuapp.com/https://nodejs.org/static/images/logos/nodejs-new-pantone-black.png";  // your image url which you needed to download first
xhr.open("GET", imgUri);
xhr.responseType = "blob";  // just make sure you get the blob type in response
xhr.onload = function() {
  data = xhr.response;
  uploadImage(data);
}
xhr.send();

function uploadImage(blobImg) {
  // console.log(blobImg);

  var imgData = new FormData();  // create a new form data
  imgData.append("image", blobImg, "node_icon.png");

  // append single image blob for single multer upload, append more images with the same feild name for array upload
  // do not forget to provide the file name while appending the form data, otherwise it will be uploaded as blob file which further needed a conversion 

  //call your node server api here and send the imgData
  var uri = encodeURI("node server api to upload with multer");
  $.ajax({
    url: uri,
    data: imgData,
    cache: false,
    contentType: false,
    processData: false,
    type: 'POST',
    error: function(err) {
      console.log('AJAX ERROR: ' + err);
      //handle the error response if any
    },
    success: function(result) {
      //handle the success response here if any
    }
  });
}

var express = require('express');
var multer  = require('multer');
var app = express();

var storage = multer.diskStorage({
  destination: function (req, file, callback) {
    callback(null, '/tmp/my-uploads')
  },
  filename: function (req, file, callback) {
    callback(null, file.fieldname + '-' + Date.now())
  }
});

var upload = multer({ storage: storage }).single('image'); // just make sure field name should be same as client form data field name

// To upload multiple image 
//var upload = multer({ storage: storage }).array('images', maxCount);
// req.files is array of `images` files
// maxCount files could be uploaded 

app.post('/uploads', function (req, res) {
  upload(req, res, function (err) {
    if (err instanceof multer.MulterError) {
      // A Multer error occurred when uploading.
    } else if (err) {
      // An unknown error occurred when uploading.
    }

    // Everything went fine.
  })
})