server.js

require("dotenv").config();

const express = require("express");
const cors = require("cors");

const app = express();

app.use(cors());
app.use(express.json());

const mongoose = require("mongoose");

const source = process.env.ATLAS_CONNECTION;
mongoose.connect(source, {
  useNewUrlParser: true,
  useCreateIndex: true,
  useUnifiedTopology: true
});

const connection = mongoose.connection;
connection.once("open", () => {
  console.log("DB connected");
});

// routes
const userRoutes = require("./controllers/UserController");
app.use("/users", userRoutes);

const path = require("path");

app.use(express.static(path.join(__dirname, "client", "build")));

app.get("*", (req, res) => {
    res.sendFile(path.join(__dirname, "client", "build", "index.html"));
});

const PORT = process.env.PORT || 8000;
app.listen(PORT, () => {
  console.log("Server is running on http://localhost:" + PORT);
});