Node.js Advanced Express

1. Middleware in Express

Learn how to use middleware for request processing, authentication, and logging.

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app.use((req, res, next) => {
    console.log('Request received');
    next();
});

This middleware logs each incoming request before it reaches the route handler.

2. Error Handling in Express

Set up global error handlers to catch and respond to errors efficiently.

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app.use((err, req, res, next) => {
    console.error(err.stack);
    res.status(500).send('Something broke!');
});

This code catches all errors and sends a 500 response to the client.

3. Authentication in Express

Learn how to implement user authentication using JWT (JSON Web Tokens).

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const jwt = require('jsonwebtoken');
app.post('/login', (req, res) => {
    const token = jwt.sign({ id: user.id }, 'your_jwt_secret');
    res.json({ token });
});

Here, the user is issued a JWT token after a successful login, which can be used for subsequent requests.

4. Setting Up for Production

Configure your Express app for production by enabling caching, setting appropriate headers, and ensuring error logging.