Implemented JWT Authentication for User login and registration

backend/middlewares/authMiddleware.js

@@ -0,0 +1,41 @@
+import jwt from 'jsonwebtoken';
+import User from '../models/userModel.js';
+
+const authRoute = async (req, res, next) => {
+    try {
+        const token = req.cookies.jwt;
+
+        if (!token) {
+            return res
+                .status(401)
+                .json({ error: 'Unauthorized - No Token Provided' });
+        }
+
+        const decoded = jwt.verify(token, process.env.JWT_SECRET);
+
+        if (!decoded) {
+            return res
+                .status(401)
+                .json({ error: 'Unauthorized - Invalid Token' });
+        }
+
+        const user = await User.findById(decoded.userId).select('-password');
+
+        if (!user) {
+            return res.status(404).json({ error: 'User not found' });
+        }
+
+        req.user = user;
+
+        next();
+    } catch (error) {
+        console.log(
+            'Error in middleware: ',
+            //@ts-expect-error error?.message is giving error due to ts configuration
+            error?.message || 'Invalid access token'
+        );
+        res.status(500).json({ error: 'Internal server error' });
+    }
+};
+
+export default authRoute;

backend/models/userModel.ts

@@ -0,0 +1,21 @@
+import mongoose from 'mongoose';
+
+const userSchema = new mongoose.Schema(
+    {
+        username: {
+            type: String,
+            required: true,
+            unique: true,
+        },
+        password: {
+            type: String,
+            required: true,
+            minlength: 6,
+        },
+    },
+    { timestamps: true }
+);
+
+const User = mongoose.model('User', userSchema);
+
+export default User;

backend/package.json

@@ -19,6 +19,7 @@
         "cors": "^2.8.5",
         "dotenv": "^16.4.5",
         "express": "^4.19.2",
+        "jsonwebtoken": "^9.0.2",
         "mongoose": "^8.4.0",
         "ts-node": "^10.9.2",
         "uuid": "^9.0.1"

backend/routes/userRoute.js

@@ -0,0 +1,10 @@
+import express from 'express';
+import authRoute from '../middlewares/authMiddleware';
+
+const router = express.Router();
+
+router.post('/register', authRoute);
+
+router.post('/login', authRoute);
+
+export default router;

backend/src/index.ts

@@ -20,6 +20,12 @@ app.get('/', (req, res) => {
     res.send('Hello from the backend!');
 });
 
+//routes
+
+import userRoute from '../routes/userRoute.js';
+
+app.use('/api/v1/auth', userRoute);
+
 app.listen(port, () => {
     console.log(`Server running on port ${port}`);
 });