server.js

const express = require("express");
const mongoose = require("mongoose");
const path = require("path");
const app = express();
const dotenv = require("dotenv");
dotenv.config();

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

// Connect to MongoDB
const db = process.env.MONGO_URI;
mongoose
  .connect(db, {
    useNewUrlParser: true,
    useCreateIndex: true,
    useUnifiedTopology: true
  })
  .then(() => console.log("Connected to MongoDB"))
  .catch(error => console.log(error));

const loginRouter = require("./routes/login");

app.use("/login", loginRouter);
app.use("/display", require("./routes/display"));

// 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}`));