Google Forms Script. Sample script on form submit. Get responses.

googleFormOnSubmit.gs

// gentleman script for google forms
// 
// gets submitted valus:
//   1. question label
//   2. question id
//   3. response value
//
// ⚠️ This is Form trigger. 
//    Open script editor from form interface
//    Install it wia Triggers
// gentleman script for google forms
// 
// gets submitted valus:
//   1. question label
//   2. question id
//   3. response value
//
// ⚠️ This is Form trigger. 
//    Open script editor from form interface
//    Install it wia Triggers
function onFormSubmit(e) {
  /** @type {FormApp.FormResponse} */
  const formResponse  = e.response;
  /** @type {Array<FormApp.ItemResponse>} */
  const itemResponses = formResponse.getItemResponses();

  const respondentEmail = formResponse.getRespondentEmail();

  let response = {}, responses = [], item;
  for (var i = 0; i < itemResponses.length; i++) {
    item = itemResponses[i].getItem();
    response = {
      id: item.getId(),
      label: item.getTitle(),
      value: itemResponses[i].getResponse()
    }
    responses.push(response);
  }

  const json = JSON.stringify({respondentEmail, responses}, null, 2);

  MailApp.sendEmail(
    "TEST.TEST@gmail.com",
    "New form response",
    '',
    {htmlBody: "<pre>" + json + "</pre>"}
  );
}

googleFormOnSubmitSheet.gs

var formSubmitOptions = {
  idColumnNum: 1,
  memoryKey: 'theLastFormId' // any string
}

/**
 * ⚠️ This is a Spreadsheet trigger
 *    Open script editor from Spreadsheet
 *    Install it wia Triggers
 * Trigger will add next ID to the form entry
 * 
 */
// function test_onFormSubmit() {
//   var event = {
//     range: SpreadsheetApp
//       .getActive()
//       .getSheetByName('Form Responces')
//       .getRange('A2')
//   }
//   onFormSubmit(event);
// }
function onFormSubmit(event) {
  // https://developers.google.com/apps-script/guides/triggers/events
  // var namedValues = event.namedValues;
  // var values = event.velues;
  var range = event.range;
  var nextId = getNextId_();
  var row = range.getRow();
  var column = formSubmitOptions.idColumnNum;
  var sheet = range.getSheet();
  var range2 = sheet.getRange(row, column);
  range2.setValue(nextId);
  console.log('Addad ID = ' + nextId + ' to range ' + range2.getA1Notation());
}

/** get next ID and writing it to Properties */
var getNextId_ = function() {
  // use lock to prevent same IDs
  var lock = LockService.getScriptLock();
  var memoryKey = formSubmitOptions.memoryKey; // any
  var memory = PropertiesService.getScriptProperties();
  var currentId = memory.getProperty(memoryKey);
  if (currentId == null) {
    currentId = 0;
  }
  currentId = parseInt(currentId);
  var nextId = currentId + 1;
  memory.setProperty(memoryKey, nextId);
  lock.releaseLock();
  return nextId;
}