Upload file with $.ajax()

main.js

var fd = new FormData();

fd.append('file', $('input[type="file"]')[0].files[0]);
$.ajax({
  url: '/photoUpload',
  data: fd,
  processData: false,
  contentType: false,
  cache: false,
  type: 'POST',
  success: function(data){
    console.log(data);
  }
});