server.js

const express = require("express");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");
const path = require("path");
const passport = require("passport");
const users = require("./routes/api/users");
const app = express();
// Bodyparser middleware
app.use(
  bodyParser.urlencoded({
    extended: false,
  })
);
app.use(bodyParser.json());
// DB Config
const db = require("./config/keys").mongoURI;
// Connect to MongoDB
mongoose
  .connect(db, { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => console.log("MongoDB successfully connected"))
  .catch((err) => console.log(err));
// Passport middleware
app.use(passport.initialize());
// Passport config
require("./config/passport")(passport);
// Routes
app.use("/api/users", users);
if (process.env.NODE_ENV === "production") {
  // Exprees will serve up production assets
  app.use(express.static("client/build"));

  // Express serve up index.html file if it doesn't recognize route
  app.get("*", (req, res) => {
    res.sendFile(path.resolve(__dirname, "client", "build", "index.html"));
  });
}
app.use(express.static(path.join(__dirname, "./client/build")));

app.get("*", function (_, res) {
  res.sendFile(
    path.join(__dirname, "./client/build/index.html"),
    function (err) {
      if (err) {
        res.status(500).send(err);
      }
    }
  );
});
const port = process.env.PORT || 5000; // process.env.port is Heroku's port if you choose to deploy the app there
app.listen(port, () =>
  console.log(`Server moving and grooving on port ${port} !`)
);