app.js

const ENV = process.env.NODE_ENV || 'production'
require('dotenv').config({
  path: `.env.${ENV}`
});

// External Module
const express = require("express");
const mongoose = require("mongoose");
const bodyParser = require("body-parser");

// Local Module
const errorController = require("./controllers/errorController");
const exampleRouter = require("./routers/exampleRouter");
const MONGO_DB_URL =
  `mongodb+srv://${process.env.MONGO_DB_USERNAME}:${process.env.MONGO_DB_PASSWORD}@kgcluster.ie6mb.mongodb.net/${process.env.MONGO_DB_DATABASE}`;

const app = express();
app.use(bodyParser.urlencoded({ extended: true }));
app.use(express.json());

app.use(exampleRouter);
app.use(errorController.get404);

const PORT = process.env.PORT || 3000;
mongoose.connect(MONGO_DB_URL).then(() => {
  app.listen(PORT, () => {
    console.log(`Server running at: http://localhost:${PORT}`);
  });
});