Resolved merge conflicts

backend/app.js

@@ -2,7 +2,8 @@ const express = require("express");
 const connectDB = require("./config/database");
 const authRoutes = require("./routes/auth");
 const noteRoutes = require("./routes/notes");
-
+const cors = require('cors');
+const rateLimit = require('express-rate-limit');
 const app = express();
 
 // Connect to MongoDB
@@ -15,4 +16,37 @@ app.use(express.json());
 app.use("/api/auth", authRoutes);
 app.use("/api/notes", noteRoutes);
 
+// CORS Middleware Setup
+const corsOptions = {
+  origin: ['*'],
+  allowedHeaders: ['Content-Type', 'Authorization'],
+  optionsSuccessStatus: 200
+};
+
+app.use(cors(corsOptions));
+
+// Rate Limiting Setup
+const limiter = rateLimit({
+  windowMs: 15 * 60 * 1000, // 15 minutes
+  max: 100, // Limit each IP to 100 requests per windowMs
+  message: "Too many requests from this IP, please try again after 15 minutes."
+});
+
+app.use(limiter);
+
+// Routes
+app.get('/', (req, res) => {
+  res.send('Welcome to the API!');
+});
+
+app.post('/data', (req, res) => {
+  res.json({ message: 'This is a POST request response' });
+});
+
+// Start the Server
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+});
+
 module.exports = app;