userId.js

let userStorage = request.body.originalDetectIntentRequest.payload.user.userStorage || JSON.stringify({});
  let userId;
  console.log("userStorage", userStorage);
  userStorage = JSON.parse(userStorage);
  console.log("userStorage_after_parsing", userStorage);

  if (userStorage.hasOwnProperty('userId')) {
    userId = userStorage.userId;
    console.log("userID In if", userId);
  } else {
    // Uses the "uuid" package. You can get this with "npm install --save uuid"
    // var uuid = require('uuid/v4');
    var uuid = require('uuid/v4');
    userId = uuid();
    userStorage.userId = userId
  }

  console.log("userID", userId);






//SENDING RESPONSE

response.send({
              'fulfillmentText' : `We both hit ${runs} runs. Sorry, You're out on the first ball! \nUnluckily, Your total score is 0 run.  \nWould you like to play again with me?`,
              'payload': {
                'google': {
                  'userStorage': JSON.stringify(userStorage)
                }
              }

            });