Express Function Logging in Firebase functions

index.js

const functions = require('firebase-functions');
const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');

/**
 * Route all firebase function requests through to express
 * See https://codeburst.io/express-js-on-cloud-functions-for-firebase-86ed26f9144c
 */
const app = express();
app.use(cors({ origin: true }));
app.use(bodyParser.json());

/**
 * This creates both express routes and google cloud routes
 * The name changes eg /hello-world/here becomes get_helloworld_here
 */
const route = (method, uri, fn) => {
  var key = uri.replace(/[^\w\-\_\/]/g, '').replace(/-/g, '').replace(/\//g, '_');
  exports[method + key] = functions.https.onRequest(fn);
  app[method](uri, exports[method + key]);
};

/**
 * Our routes
 */
route('get', '/hello-tom', (request, response) => {
  response.send('hello tom!');
});

route('get', '/hello-world', (request, response) => {
  response.send('hello world!');
});

route('get', '/hello-there', (request, response) => {
  response.send('hello there!');
});

/*
app.listen(3000, function () {
  console.log('Example app listening on port 3000!');
});
*/

/**
 * Finally, mount the express app to /api/*
 */
exports.api = functions.https.onRequest((request, response) => {
  if (!request.path) {
    request.url = `/${request.url}` // prepend '/' to keep query params if any
  }
  return app(request, response)
});