server.js

const express = require('express');
const mongoose = require('mongoose');
const path = require('path');

const app = express();
app.use(express.json());

// DB Config
const db = process.env.mongoURI || require('./config/keys').mongoURI;

// Connect to Mongo
mongoose
  .connect(db, { useUnifiedTopology: true, useNewUrlParser: true })
  .then(() => console.log('MongoDB connected...'))
  .catch(err => console.log(err));

// Use Routes
app.use('/api/applications', require('./routes/api/applications'));
app.use('/api/users', require('./routes/api/users'));
app.use('/api/auth', require('./routes/api/auth'));

// Serve static assets if in production
if (process.env.NODE_ENV === 'production') {
  // Set static folder
  app.use(express.static('client/build'));

  app.get('*', (req, res) => {
    res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
  });
}

const port = process.env.PORT || 4000;
app.listen(port, () => console.log(`Server started on port ${port}`));