Initialized and setup backend

backend/.gitignore

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+/node_modules
+.env

backend/package.json

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+{
+  "name": "backend",
+  "version": "1.0.0",
+  "main": "index.js",
+  "type": "module",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "dev": "node --watch ./src/index.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "description": "",
+  "dependencies": {
+    "cors": "^2.8.5",
+    "dotenv": "^16.4.5",
+    "express": "^4.21.1",
+    "mongoose": "^8.8.0",
+    "socket.io": "^4.8.1"
+  }
+}

backend/src/config/dbConfig.js

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+import mongoose from "mongoose";
+import { DB_URL } from "./veriables.js";
+
+export const connectDB = async () => {
+    try{
+        await mongoose.connect(DB_URL);
+        console.log("Database connected successfully");
+    }
+    catch(err){
+        console.log("Database connection failed");
+        console.log(err);
+    }
+}

backend/src/config/veriables.js

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+import dotenv from "dotenv";
+dotenv.config();
+
+export const PORT = Number(process.env.PORT);
+export const DB_URL = process.env.DB_CONNECTION;

backend/src/index.js

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+import express from 'express'
+import cors from 'cors'
+import { createServer } from 'http'
+import { Server } from 'socket.io'
+import { PORT } from './config/veriables.js';
+import { connectDB } from './config/dbConfig.js';
+
+const app = express();
+const httpServer = createServer(app);
+
+const io = new Server(httpServer, {
+    cors: {
+        origin: "*"
+    }
+})
+
+app.use(cors())
+app.use(express.json())
+app.get("/ping", (_req, res) => {
+    res.json({ message: "pong" })
+})
+
+await connectDB();
+httpServer.listen(PORT, () => {
+    console.log(`Server is running on http://localhost:${PORT}`)
+})