server.js

const express = require("express");
const mongoose = require("mongoose");
const routes = require("./routes");
const PORT = process.env.PORT || 3001;

// Creating express app
const app = express();
// Define middleware here
app.use(express.urlencoded({ extended: true }));
app.use(express.json());

// Add routes, both API and view
app.use(routes);

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

// Connect to the Mongo DB
mongoose.connect(process.env.MONGODB_URI || "mongodb://localhost/Users", {
  useNewUrlParser: true,
  useUnifiedTopology: true,
  useCreateIndex: true,
  useFindAndModify: false,
});
mongoose.Promise = global.Promise;
const db = mongoose.connection;

// Start the API server
app.listen(PORT, function () {
  console.log(`🌎  ==> API Server now listening on PORT ${PORT}!`);
});