Back-End for Sign-In Page

.env

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+PORT=5000
+MONGO_URI=your_mongodb_connection_string
+JWT_SECRET=your_jwt_secret

app.js

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+// src/app.js
+const express = require('express');
+const cors = require('cors');
+const connectDB = require('./config/db');
+const authRoutes = require('./routes/authRoutes');
+require('dotenv').config();
+
+const app = express();
+
+connectDB();
+
+app.use(express.json());
+app.use(cors());
+app.use('/api/auth', authRoutes);
+
+module.exports = app;

authController.js

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+// src/controllers/authController.js
+const User = require('../models/userModel');
+const bcrypt = require('bcryptjs');
+const jwt = require('jsonwebtoken');
+
+exports.login = async (req, res) => {
+  const { email, password } = req.body;
+
+  try {
+    const user = await User.findOne({ email });
+    if (!user) return res.status(400).json({ message: 'Invalid email or password' });
+
+    const isMatch = await bcrypt.compare(password, user.password);
+    if (!isMatch) return res.status(400).json({ message: 'Invalid email or password' });
+
+    const token = jwt.sign({ userId: user._id }, process.env.JWT_SECRET, { expiresIn: '1h' });
+    res.json({ token, message: 'Login successful' });
+  } catch (error) {
+    res.status(500).json({ message: 'Server error' });
+  }
+}

authRoutes.js

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+// src/routes/authRoutes.js
+const express = require('express');
+const router = express.Router();
+const authController = require('../controllers/authController');
+
+router.post('/login', authController.login);
+
+module.exports = router;

db.js

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+// src/config/db.js
+const mongoose = require('mongoose');
+
+const connectDB = async () => {
+  try {
+    await mongoose.connect(process.env.MONGO_URI, {
+      useNewUrlParser: true,
+      useUnifiedTopology: true,
+    });
+    console.log('MongoDB connected');
+  } catch (err) {
+    console.error('MongoDB connection error:', err);
+    process.exit(1);
+  }
+};
+
+module.exports = connectDB;

server.js

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+// server.js
+const app = require('./src/app');
+
+const PORT = process.env.PORT || 5000;
+app.listen(PORT, () => console.log(`Server running on port ${PORT}`));

userModel.js

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+// src/models/userModel.js
+const mongoose = require('mongoose');
+
+const userSchema = new mongoose.Schema({
+  email: { type: String, required: true, unique: true },
+  password: { type: String, required: true },
+});
+
+module.exports = mongoose.model('User', userSchema);