JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input type="hidden" name="name" value="Name1" />
    <input type="button" id="submitIt" value="Submit" />
</form>

JavaScript

$(document).ready(function() {
	$('#submitIt').click(function() {
    	var d = new FormData($('form')[0]);        
        alert(d.name);
    });
});