Proxy to run Firebase Functions

api.js

'use strict';

const admin = require('firebase-admin');

module.exports = function (app) {

    app.get('/api', function (req, res) {
        res.json({ 'version': '0.1' })
    });

    app.post('/api/jedi', function (req, res) {
        admin.database().ref('/jedi').push().set({
            'name': req.body.name,
            'race': req.body.race,
            'planet': req.body.planet,
            'color': req.body.color
        })
        res.json({ 'success': true })
    })

    app.get('/api/jedi', function (req, res) {
        admin.database().ref('/jedi').once('value').then(function(snapshot) {
            res.json(snapshot)
        })
    })
}

index.js

'use strict';

const admin = require('firebase-admin');
const express = require('express');

/** begin configuration for cloud */
const functions = require('firebase-functions');
const serviceAccount = require('./serviceAccountKey.json');
admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: 'https://jedi-backend-demo.firebaseio.com'
  });

var app = express();
/** end configuration for cloud */

/** begin config handlebars */
const hbs = require('express-hbs')
app.engine('hbs', hbs.express4({
    partialsDir: './views/partials',
    layoutsDir: './views'
}))
app.set('views', './views')
app.set('view engine', 'hbs')
/** end config handlebars */

/** add api */
require('./api')(app);

/** deploy firebase */
exports.app = functions.https.onRequest(app);

package.json

{
  "name": "functions",
  "description": "Jedi Backend",
  "scripts": {
    "serve": "firebase serve --only functions,hosting",
    "shell": "firebase experimental:functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions,hosting",
    "logs": "firebase functions:log"
  },
  "dependencies": {
    "express": "4.15.3",
    "express-hbs": "1.0.4",
    "firebase": "^3.1",
    "firebase-admin": "~5.8.1",
    "firebase-functions": "^0.8.1"
  },
  "private": true
}