JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/dot-luv/jquery-ui.css">
<form id="form">
    <input type="text" value="test" name="testName" />
</form>

JavaScript

var form = $('#form');
var sendFormData = form.serializeArray();
sendFormData.push({ "name": "Name", "value": "test"});
alert(sendFormData.length);
alert(sendFormData[1].name);
alert(sendFormData[1].value);