I haven't practiced using CSRF tokens in JavaScript. Now I need to send the token to the server. Can I use POST request of fetch API for this, and how it is done? (I only know JavaScript. I don't understand AJAX, jQuery etc.).

Do I need to write something in the HTML file for my weapon with the token? Running PHP Laravel for backend?

I have this code which gives me a 419 error:

form1.addEventListener('submit', (e) => {
  e.preventDefault()

  const formDatas = new FormData(form1);
  const data = new URLSearchParams(formDatas);

  fetch(f1_search_url, {
      headers: {
        "X-CSRF-Token": my_token, //