index.js

require("dotenv").config(); //needed to fetch data from .env file
const express = require("express");
const mongoose = require("mongoose");
const userIP = require("user-ip");
const cookieParser = require("cookie-parser");
const securedHeaders = require("helmet");
const { limiter } = require("./utils/api-rate-limiter.js");

const { SERVER_PORT } = require("./configs/server.config.js");
const app = express();
const db_url =
  process.env.DB_URL || `mongodb://127.0.0.1:27017/${process.env.DB_NAME}`;

app.use(express.urlencoded({ extended: true }));
app.use(express.json());
app.use(cookieParser());
app.use(securedHeaders());
app.use(limiter);

// connect to MongoDB
// Event handlers for successful connection and connection error
const connectDB = async () => {
  console.time("Mongodb connection time:");
  const connect = await mongoose.connect(db_url, {
    // useNewUrlParser: true, // DEPRECATED
    // useUnifiedTopology: true  // DEPRECATED
  });
  console.timeEnd("Mongodb connection time:");
  console.log(`MongoDB Connected to Host: ${connect.connection.host}`);
};

// FIRST CONNECT TO MONGODB THEN START LISTENING TO REQUESTS
connectDB()
  .then(() => {
    app.listen(SERVER_PORT, () => {
      console.log(`Listening all requests on port ${SERVER_PORT}`);
    });
  })
  .catch((e) => {
    console.log("Can't connect to DB:", e.message); // IF DB CONNECT FAILED, CATCH ERROR
  });

/**************************HOME PAGE**************************** */
app.get("/", (req, res) => {
  res.status(200).send(`<h2>Backend Running! 🎉</h2>`);
});

/**************  IMPORT API's ********** */
require("./routes/auth.routes")(app);
require("./routes/post.routes")(app);