server.js

const express = require("express");
const bodyParser = require("body-parser");
const mongoose = require("mongoose");
const cors = require("cors");
require("dotenv").config();

const mongoURI = process.env.MONGODB_URI;

const app = express(); //initializing express

const items = require("./routes/api"); //importing the route file

//connecting to mongo
mongoose
  .connect(mongoURI, { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => console.log("MongoDB Connected"))
  .catch((err) => console.log(err));

app.use(cors());
//applying middleware bodyparser
app.use(bodyParser.json());

app.use(express.static(__dirname + "/public"));

if (process.env.NODE_ENV === "production") {
  app.use(express.static("client/build"));
}

//using route
app.use("/api", items);

const port = process.env.PORT || 5000;

app.listen(port, () => console.log(`Server running on port: ${port}`));