const form = document.getElementById('form');
 
form.addEventListener('submit', function(event) {

  event.preventDefault();
 
  const uploadElement = document.getElementById('file'); // Select file input element
  const file = uploadElement.files[0]; // Selects file at position 0 (for single file)
 
  const payload = new FormData(); // Sending in FormData object will set headers
  payload.append('CV', file, 'CV.pdf'); // Appends file to FormData object
 
  fetch('https://httpbin.org/post', { // Endpoint is a test API
    method: "POST", // or "PUT"
    body: payload,
  })
    .then(res => res.json())
    .then(data => console.log(data))
    .catch(err => console.log(err))
});