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>
<div>
	<button onclick="refreshCustomData()">Refresh Custom DataSource</button>
</div>
<div id="pivot-container"></div>

JavaScript

let pivot = new Flexmonster({
  container: "pivot-container",
  componentFolder: "https://cdn.flexmonster.com/",
  height: 400,
  report: {
    "dataSource": {
      "type": "api",
      "url": pivotEndpoint,
      "index": "any"
    },
    "slice": {
      "rows": [{
          "uniqueName": "Color",

        },
        {
          "uniqueName": "[Measures]"
        }
      ],
      "columns": [{
        "uniqueName": "Country",

      }],
      "measures": [{
        "uniqueName": "Price",
        "aggregation": "sum"
      }]
    },
    options: {
    caseSensitiveMembers: true
    }
  }
});

function pivotEndpoint(request, successCallback, errorCallback) {
  request = JSON.parse(request);
  var result = null;
  if (request.type == "handshake") {} else if (request.type == "fields") {
    result = getSchema(request.index);
  } else if (request.type == "members") {
    result = getMembers(request.index, request.field, request.page);
  } else if (request.type == "select") {
    result = getSelectResult(request.index, request.query, request.page);
  } else {
    errorCallback("Request type " + request.type + " is not implemented.");
  }
  successCallback(result);
}

function pivotEndpoint2(request, successCallback, errorCallback) {
  request = JSON.parse(request);
  var result = null;
  if (request.type == "handshake") {} else if (request.type == "fields") {
    result = getSchema(request.index);
  } else if (request.type == "members") {
    result = getMembers(request.index, request.field, request.page);
  } else if (request.type == "select") {
    result = getSelectResult2(request.index, request.query, request.page);
  } else {
    errorCallback("Request type " + request.type + " is not implemented.");
  }
  successCallback(result);
}

function getSchema(index) {
  return {
    "fields": [{
      "uniqueName": "Color",
      "type": "string"
    }, {
      "uniqueName": "Country",
      "type": "string"
    }, {
      "uniqueName": "Price",
      "type":...