Google Sheets Script to Export Data to MongoDB Stitch API Service

exportEventsToMongoDB.js

/****
 * Export the events from the sheet to a MongoDB Database via Stitch
 ****/
function exportEventsToMongoDB() {
  var spreadsheet = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = spreadsheet.getSheetByName("Events");
  var headerRows = 1;  // Number of rows of header info (to skip)
  var range = sheet.getDataRange(); // determine the range of populated data
  var numRows = range.getNumRows(); // get the number of rows in the range
  var data = range.getValues(); // get the actual data in an array data[row][column]
  
  for (var i=headerRows; i<numRows; i++) {
    var eventIdCell = range.getCell(i+1, columns.event_id+1);
    var desc = data[i][columns.desc];
    var date_start = Utilities.formatDate(new Date(data[i][columns.date_start]), "GMT", "yyyy-MM-dd'T'HH:mm:ss'Z'");
    var date_end = Utilities.formatDate(new Date(data[i][columns.date_end]), "GMT", "yyyy-MM-dd'T'HH:mm:ss'Z'");    
    // Make a POST request with form data.
    var formData = {
      'name': data[i][columns.desc],
      'location': data[i][columns.loc],
      'date_start': date_start,
      'date_end': date_end,
      'status': data[i][columns.status],
      'owner': data[i][columns.owner],
      'url': data[i][columns.url],
      'type': data[i][columns.type],
      'event_id': data[i][columns.event_id]
    };
    var options = {
      'method' : 'post',
      'payload' : formData
    };
    if (desc) {
      var insertID = UrlFetchApp.fetch('https://webhooks.mongodb-stitch.com/api/client/v2.0/app/stitch-sheets-zkvuv/service/sheets/incoming_webhook/import', options);
      eventIdCell.setValue(insertID); // Insert the new event ID
    }
  }
}

Hi @mrlynn

var eventIdCell = range.getCell(i+1, columns.event_id+1);

Where is the variable columns here?