Express

1. Routing

   Route methods, path patterns, route parameters, route handlers, express.Router, and response methods.

2. Using middleware

   Application-level, router-level, built-in and third-party middleware and the middleware stack order.

3. Writing middleware

   Writing middleware functions with req, res and next, configurable middleware, and request lifecycle.

4. Error handling

   Default error handler, error-handling middleware, async errors, and next(err).

5. Template engines

   View engines, res.render, and views configuration.

6. Behind proxies

   trust proxy setting, client IPs, and protocol detection behind reverse proxies.

7. Database integration

   Connecting Express to databases and common driver patterns.

8. Debugging

   The debug module and DEBUG environment variable for tracing internals.

9. Performance best practices

   gzip compression, avoiding sync functions, logging, caching, clustering, and reverse proxies.

10. Security best practices

    TLS, helmet, cookie security, input validation, rate limiting, and dependency security.

11. Health checks and graceful shutdown

    Liveness and readiness checks and draining connections on shutdown.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.

Source: endoflife.date