JSFiddle - React, Tailwind, and code Playground

HTML

<form enctype="multipart/form-data" method="post">
    <label> Login <input type="text" name="login"></label>
<label> Name <input type="text" name="fio"></label>
    <label> Pass <input type="password" name="password"></label>
    <button>Submit</button>
</form>

JavaScript

var form = document.querySelector('form');


form.addEventListener('submit', function (e) {
 e.preventDefault();
    console.log(this);
    console.log(new FormData(this).getAll('fio'));
});