server.js

const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const path = require('path');

const items = require('./routes/api/items');

const app = express();

//Bodyparser Middleware
app.use(bodyParser.json());

//DB config
const db = require('./config/key').mongoURI;

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

  //use Routes
  app.use('/api/items', items);

  //Serve Static assests 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 || 5000;

  app.listen(port, () => console.log(`Server started on port ${port}`));