index.js

const express = require('express');
const mongoose = require('mongoose');
const cookieSession = require('cookie-session');
const passport = require('passport');
const bodyParser = require('body-parser');
const keys = require('./config/keys');
require('./models/User');
require('./models/Survey');
require('./services/passport');

mongoose.connect(keys.mongoURI);

const app = express();

// middlewares
app.use(bodyParser.json());
app.use(cookieSession({ maxAge: 2592000000, keys: [keys.cookieKey] }));
app.use(passport.initialize());
app.use(passport.session());

require('./routes/authRoutes')(app);
require('./routes/billingRoutes')(app);
require('./routes/surveyRoutes')(app);

if (process.env.NODE_ENV === 'production') {
  // make sure Express serves production assets
  app.use(express.static('client/build'));
  // make sure Express serves index.html if unrecognized route
  const path = require('path');
  app.get('*', (req, res) => {
    res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
  });
}

const PORT = process.env.PORT || 5000; // dynamic port binding - use env var in Heroku, and port 5000 locally
app.listen(PORT);