how to connect gmail inbox to node js code example

Example 1: build an api in nodejs using express to send emails using the gmail rest api without client libraries

def send_message(service, user_id, message):
  try:
    message = service.users().messages().send(userId=user_id, body=message).execute()

    print('Message Id: %s' % message['id'])

    return message
  except Exception as e:
    print('An error occurred: %s' % e)
    return None


def create_message_with_attachment(sender, to, subject, message_text, file):
  message = MIMEMultipart()
  message['to'] = to
  message['from'] = sender
  message['subject'] = subject

  msg = MIMEText(message_text)
  message.attach(msg)

  content_type, encoding = mimetypes.guess_type(file)

  if content_type is None or encoding is not None:
    content_type = 'application/octet-stream'

  main_type, sub_type = content_type.split('/', 1)

  if main_type == 'text':
    fp = open(file, 'rb')
    msg = MIMEText(fp.read().decode("utf-8"), _subtype=sub_type)
    fp.close()
  elif main_type == 'image':
    fp = open(file, 'rb')
    msg = MIMEImage(fp.read(), _subtype=sub_type)
    fp.close()
  elif main_type == 'audio':
    fp = open(file, 'rb')
    msg = MIMEAudio(fp.read(), _subtype=sub_type)
    fp.close()
  else:
    fp = open(file, 'rb')
    msg = MIMEBase(main_type, sub_type)
    msg.set_payload(fp.read())
    fp.close()
  filename = os.path.basename(file)
  msg.add_header('Content-Disposition', 'attachment', filename=filename)
  message.attach(msg)

  raw_message = base64.urlsafe_b64encode(message.as_string().encode("utf-8"))
  return {'raw': raw_message.decode("utf-8")}

Example 2: build an api in nodejs using express to send emails using the gmail rest api without client libraries

/**
* @param $service Google_Service_Gmail an authorized Gmail API service instance.
* @param $userId string User's email address or "me"
* @param $message Google_Service_Gmail_Message
* @return null|Google_Service_Gmail_Message
*/
function sendMessage($service, $userId, $message) {
 try {
   $message = $service->users_messages->send($userId, $message);
   print 'Message with ID: ' . $message->getId() . ' sent.';
   return $message;
 } catch (Exception $e) {
   print 'An error occurred: ' . $e->getMessage();
 }

 return null;
}