index.js

// index.js
const express = require('express');
const mongoose = require('mongoose');
const bcrypt = require('bcrypt');
const jwt = require('jsonwebtoken');

const app = express();
const PORT = process.env.PORT || 3000;

// Connect to MongoDB
mongoose.connect('mongodb://localhost:27017/node-auth', {
  useNewUrlParser: true,
  useUnifiedTopology: true,
  useCreateIndex: true
}).then(() => {
  console.log('Connected to MongoDB');
}).catch((err) => {
  console.error('Error connecting to MongoDB', err);
});

// Middleware
app.use(express.json());

// User Model
const User = require('./models/User');

// Signup Route
app.post('/api/signup', async (req, res) => {
  try {
    const { email, password } = req.body;
    const hashedPassword = await bcrypt.hash(password, 10);
    const user = new User({ email, password: hashedPassword });
    await user.save();
    res.status(201).json({ message: 'User created successfully' });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

// Login Route
app.post('/api/login', async (req, res) => {
  try {
    const { email, password } = req.body;
    const user = await User.findOne({ email });
    if (!user) {
      return res.status(401).json({ message: 'Authentication failed' });
    }
    const isPasswordValid = await bcrypt.compare(password, user.password);
    if (!isPasswordValid) {
      return res.status(401).json({ message: 'Authentication failed' });
    }
    const token = jwt.sign({ userId: user._id }, 'secretkey', { expiresIn: '1h' });
    res.status(200).json({ token });
  } catch (error) {
    res.status(500).json({ error: error.message });
  }
});

app.listen(PORT, () => {
  console.log(`Server is running on port ${PORT}`);
});