JSFiddle - React, Tailwind, and code Playground

HTML

<form id="my-id">
    <input type="text" name="name1" value="value1" />
    <input type="text" name="name2" value="value2" />
</form>

JavaScript

var array = $('#my-id').serializeArray();
alert(array.length);
array.push({name: 'html', value: 'Test'});
alert(array.length);