server.js

/**
 * Copyright 2018, Google, Inc.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

 'use strict';

 // [START app]
 const express = require('express');
 const app = express();
 
 app.get('/', (req, res) => {
   res.send('Hello from App Engine!');
 });
 
 // Listen to the App Engine-specified port, or 8080 otherwise
 const PORT = process.env.PORT || 8080;
 app.listen(PORT, () => {
   console.log(`Server listening on port ${PORT}...`);
 });
 // [END app]
 
 module.exports = app;