What are some common mistakes in Express.js middleware?

What are some common mistakes developers make when using middleware in Express.js?

Some common mistakes include not handling errors properly, using middleware in the wrong order, and not understanding the request-response cycle.

Can you explain why the order of middleware is important?

Yes, the order of middleware is crucial because Express processes them in the order they are defined. If you place a middleware that ends the response before others that need to run, those won't execute.

What about error handling in middleware?

Error handling middleware should be defined last in your middleware stack. It should have four parameters: err, req, res, and next, to properly catch and handle errors.

Are there any best practices for writing middleware?

Absolutely! Some best practices include keeping middleware functions small and focused, using async/await for asynchronous operations, and documenting your middleware for better maintainability.