processor.js

// Get headers from input.
orgLevelHeaders = document.getElementById('org_level_headers').value.split(',');

// Cut the data headers from the levels.
// Length will be the number of columns needed to determine hierarchy.
const dataHeaders = results.meta.fields.splice(orgLevelHeaders.length);

let varString = 'finalData';
results.data.forEach(function (el, index) {
  for (i = 0; i < orgLevelHeaders.length; i++) {

    // If header value is blank, then it is a parent of something.
    if (el[orgLevelHeaders[i]] === '') {
      eval(varString + " = {}");
      eval(varString + ".data = {}");
      eval(varString + ".children = {}");

      // Gather data.
      let data = {};
      dataHeaders.forEach(function (header, ind) {
        data[header] = el[header];
      });

      eval(varString + ".data = " + JSON.stringify(data) + ';');
      break;
    }

    // If it isn't blank, then add it to the variable string.
    varString += '.children["' + el[orgLevelHeaders[i]] + '"]';
  }
  varString = 'finalData';
}
downloadFile(finalData);