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)) });