index.js

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

require('./models/Users');
require('./models/Survey');
require('./services/passport');

mongoose.connect(keys.mongoURI, { useNewUrlParser: true, useUnifiedTopology: true });

const app = express();
app.use(bodyParser.urlencoded( { extended:true } ) );
app.use(bodyParser.json());
 
app.use(cookieSession( { 
      maxAge : 30 *  24 * 60 * 60 * 1000,
      keys : [keys.cookieKey],
      sameSite:"Strict",
} ) );

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'){
//production assests like main.js or main.css
      app.use(express.static('client/build'));

//Express will serve up index.html. (catch all)
      const path = require('path');
      app.get('*', ( req, res ) => {
            res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
      } );
}

const PORT = process.env.PORT || 5000;
app.listen(PORT);