Node JS : Upload Image to server using jQuery Ajax

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Javascript

Node.js

Hi
I want to upload image to server. I know I can do multipart-upload but problem is, In my case I have url of image that is on different server. I have to make a ajax call to load that image at client side that I have already done,then make another ajax call to upload that image to server where server side app (i. e. in node.js) is running. On server side I am able to get that image and saved successfully to desired location but the problem is when I open that image then it show image in not correct for or it is corrupted. My code is

// ajax call to download image from wp 
jQuery.ajax({
    url: imageUrl,
    type: 'GET',
    processData : false,
    success: function(res){
        // once image loaded, upload to node server
        var dataObj = {
            "license": license_code,
            "wpImageId": wpImageId,
            "imageName": imageName,
            "imageData": res
        }

        upload_image(formData);        
    },
    error: function(error){
        alert(JSON.stringify(error));
    }
});

// code to upload 
function upload_image(dataObj){
    jQuery.ajax({
        url: hostUrl + "api/v1/service/uploadImageToServer",
        type: "POST",
        data: dataObj,        
         processData: false,
        success: function  (res) {
            if(res.errorCode == 0)
                console.log('success');
            else
                console.log(res.errorCode);                
        },
        error: function(error){
            alert(JSON.stringify(error));
        }
    });
}

// Now server side code is
service.uploadImage = function(request, response){
	var result = new Object();
	result.errorCode = errorCodes.SUCCESS;

	var wpImgId = request.body.wpImageId;
	var imgName = wpImgId + '-img.jpg';
	var imgData = request.body.imageData;

	// First way that I tried
	var wstream = fs.createWriteStream(filename, {'encoding':'binary'});
	wstream.write(imgData);
	wstream.on('finish', function () {
  		console.log('finish');
	});

	wstream.end(function (){
		console.log('end');
		service.pushResponseToClients(request, response, result, null);
	});



	// Second way 
	fs.writeFile(filename, imgData, function(error) {
		if(error){
			console.log(JSON.stringify(error));
			service.pushResponseToClients(request, response, result, null);
			return;
		}
	});
});

I both case able to save the file but image is not in correct format. I am tried to save in .jpg.
I can directly load that image from server but I have to do this in that way.

Please help :)