JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://s3.amazonaws.com/flexmonster/2.3/demo.css">
<script src="https://cdn.flexmonster.com/flexmonster.js"></script>
<button onclick="expandData()">
 Expand data
</button>

<div id="pivot-container"></div>

JavaScript

var pivot = new Flexmonster({
  container: "#pivot-container",
  componentFolder: "https://cdn.flexmonster.com/",
  width: "100%",
  height: 600,
  toolbar: true,
  report: getReport()
});


function expandData() {
	pivot.expandData("Month");
}

function getReport() {
	return {
    dataSource: {
        type: "json",
        data: [
        {
    ScenarioKey: 1,
    ScenarioName: 'Actual',
    OrganizationKey: 3,
    OrganizationName: 'Northeast Division',
    AccountKey: 80,
    AccountDescription: 'Building Leasehold',
    Amount: 586,
    Year: '2010',
    Month: '12'
  },
  {
    ScenarioKey: 2,
    ScenarioName: 'Budget',
    OrganizationKey: 3,
    OrganizationName: 'Northeast Division',
    AccountKey: 80,
    AccountDescription: 'Building Leasehold',
    Amount: 550,
    Year: '2010',
    Month: '12'
  },
  {
    ScenarioKey: 2,
    ScenarioName: 'Budget',
    OrganizationKey: 3,
    OrganizationName: 'Northeast Division',
    AccountKey: 81,
    AccountDescription: 'Vehicles',
    Amount: 380,
    Year: '2010',
    Month: '12'
  },
  {
    ScenarioKey: 1,
    ScenarioName: 'Actual',
    OrganizationKey: 3,
    OrganizationName: 'Northeast Division',
    AccountKey: 81,
    AccountDescription: 'Vehicles',
    Amount: 363,
    Year: '2010',
    Month: '12'
  },
  {
    ScenarioKey: 1,
    ScenarioName: 'Actual',
    OrganizationKey: 3,
    OrganizationName: 'Northeast Division',
    AccountKey: 82,
    AccountDescription: 'Equipment',
    Amount: 35,
    Year: '2010',
    Month: '12'
  },
  {
    ScenarioKey: 2,
    ScenarioName: 'Budget',
    OrganizationKey: 3,
    OrganizationName: 'Northeast Division',
    AccountKey: 82,
    AccountDescription: 'Equipment',
    Amount: 40,
    Year: '2010',
    Month: '12'
  },
  {
    ScenarioKey: 2,
    ScenarioName: 'Budget',
    OrganizationKey: 3,
    OrganizationName: 'Northeast Division',
    AccountKey: 83,
    AccountDescription: 'Furniture and Fixtures',
    Amount: 100,
    Year: '2010',
    Month: '12'
 ...