JSFiddle - React, Tailwind, and code Playground

HTML

<form>
     <input type="checkbox" name="checkbox[]" checked="checked" value="1" />
     <input type="checkbox" name="checkbox[]" checked="checked" value="2" />
     <input type="checkbox" name="checkbox[]" checked="checked" value="3" />
</form>

JavaScript

console.log($("form").serialize());
console.log($("form").serializeArray());
console.log($("form input").serializeArray());