formidable upload file for express

uploadFile.js

app.post('/uploadFile',function (req,res) {
  // create an incoming form object
  var form = new formidable.IncomingForm();
  // specify that we want to allow the user to upload single files in a single request
  form.multiples = false;
  //keep the file upload extensions
  form.keepExtensions = true;
  // 500M limit
  form.maxFieldsSize = 500 * 1024 * 1024;  
  // store all uploads in the /uploads directory
  form.uploadDir = path.join(__dirname, './tmp');

  // every time a file has been uploaded successfully,
  // rename it to it's orignal name
  form.on('file', function(field, file) {
    //go for you code
  });

  // log any errors that occur
  form.on('error', function(err) {
    console.error('An error has occured: \n' + err);
  });

  // once all the files have been uploaded, send a response to the client
  form.on('end', function() {
    res.end('success');
  });

  // parse the incoming request containing the form data
  form.parse(req);

})