Use Twilio Lookup to determine carrier and phone number type (mobile, landline, voip)

// Description
// Use Twilio Lookup to determine carrier and phone number type (mobile, landline, voip)

exports.handler = function (context, event, callback) {
  // Make sure under Functions Global Config tab:
  // "Add my Twilio Credentials (ACCOUNT_SID) and (AUTH_TOKEN) to ENV" is CHECKED
  const client = context.getTwilioClient();

  // Pass in phoneNumber as a URL query parameter
  // Example: https://x.x.x.x/<path>?phoneNumber=%2b15105550100
  const phoneNumber = event.phoneNumber || '+15105550100';

  client.lookups
    .phoneNumbers(phoneNumber)
    .fetch({ type: 'carrier' })
    .then((result) => {
      console.log(result.carrier);
      return callback(null, result);
    })
    .catch((error) => {
      console.error(error);
      return callback(error, null);
    });
};