server.js

const express = require("express");
const bodyParser = require("body-parser");
const mongoose = require("mongoose");
const routes = require("./routes");
const path = require("path");

const PORT = process.env.PORT || 3001;
const app = express();

// Configure body parser for AJAX requests
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

// Serve up static assets (usually on heroku)
if (process.env.NODE_ENV === "production") {
  app.use(express.static("client/build"));
}

// Send every request to the React app
// Define any API routes before this runs
// Add routes, both API and view
app.use(routes);

var MONGODB_URI = process.env.MONGODB_URI || "mongodb://localhost/lms";
// Set mongoose to leverage built in JavaScript ES6 Promises
mongoose.Promise = Promise;
// Connect to the Mongo DB
mongoose.connect(MONGODB_URI);

app.listen(PORT, function() {
  console.log(`🌎 ==> Server now on port ${PORT}!`);
});