Update index.js

backend/index.js

@@ -1,23 +1,28 @@
+// Load environment variables from the .env file
 require('dotenv').config();
 
-const express = require('express');
-const path = require('path');
-const bodyParser = require('body-parser');
-const cors = require('cors');
-const mongoose = require('mongoose');
-const authRoutes = require('./routes/authRoutes');
-const catalogRoutes = require('./routes/catalogRoutes');
-const userRoutes = require('./routes/userRoutes');
-const cartRoutes = require('./routes/cartRoutes');
-const orderRoutes = require('./routes/orderRoutes');
+// Import necessary libraries
+const express = require('express');  // Express.js is a web application framework for Node.js
+const path = require('path');  // Node.js module for working with file paths
+const bodyParser = require('body-parser');  // Middleware to parse incoming request bodies
+const cors = require('cors');  // Middleware for enabling Cross-Origin Resource Sharing
+const mongoose = require('mongoose');  // Mongoose is an ODM library for MongoDB
+const authRoutes = require('./routes/authRoutes');  // Import authentication routes
+const catalogRoutes = require('./routes/catalogRoutes');  // Import catalog-related routes
+const userRoutes = require('./routes/userRoutes');  // Import user-related routes
+const cartRoutes = require('./routes/cartRoutes');  // Import shopping cart routes
+const orderRoutes = require('./routes/orderRoutes');  // Import order-related routes
 
+// Set the public path for serving static files
 const publicPath = path.join(__dirname, '..', 'frontend', 'public');
 const port = process.env.PORT || 5000;
 
+// Create an instance of the Express application
 const app = express();
 
 let connectionRetries = 0;
 
+// Function to connect to the MongoDB database with retry mechanism
 const connectWithRetry = () => {
   console.log('CONNECTING TO DB...');
 
@@ -33,6 +38,7 @@ const connectWithRetry = () => {
 
     connectionRetries++;
 
+    // Retry connection with a delay if the number of retries is within a limit
     if (connectionRetries <= 4) {
       setTimeout(connectWithRetry, 5000);
     } else {
@@ -41,22 +47,26 @@ const connectWithRetry = () => {
   });
 };
 
+// Initial database connection attempt
 connectWithRetry();
 
-app.use(cors());
+// Middleware setup
+app.use(cors());  // Enable Cross-Origin Resource Sharing
 app.use(bodyParser.urlencoded({ extended: true }));
 app.use(
   bodyParser.json({
     limit: '10MB',
     type: 'application/json',
   }),
 );
-app.use(express.static(publicPath));
+app.use(express.static(publicPath));  // Serve static files
 
+// Define routes for different modules
 app.use('/api/auth', authRoutes);
 app.use('/api/catalog', catalogRoutes);
 app.use('/api/user', userRoutes);
 app.use('/api/cart', cartRoutes);
 app.use('/api/order', orderRoutes);
 
+// Start the server and listen on the specified port
 app.listen(port, () => console.log(`SERVER NOW RUNNING ON PORT ${port}...`));