JSFiddle - React, Tailwind, and code Playground

HTML

<form>
    <input id="test1" name="nodeType" type="hidden"/>
    <div id="test2"></div>
</form>
<div id="out1"></div>
<div id="out2"></div>

JavaScript

jQuery("#out1").text( 
    jQuery("#test1").closest("form").length
);

jQuery("#out2").text( 
    jQuery("#test2").closest("form").length
);