node file upload progress streaming

file-upload-server.js

var http = require('http');
var fs = require('fs');

http.createServer(function(request, response){
  var newFile = fs.createWriteStream('file-upload.jpg');
  var fileSize = request.headers['content-length'];
  var uploadedBytes = 0;
  
  request.on('readable', function(){
    var chunk = request.read();
    while(chunk !== null){
      uploadedBytes += chunk.length;
      chunk = request.read()
      var progress = (uploadedBytes / fileSize) * 100;
      response.write('Progress: ' + progress.toFixed(2) + '%\n');
    }
  });

  
  request.pipe(newFile);
  request.on('end', function(){
    response.end('File uploaded!');
  });
}).listen(1337);