Question Bank

Which of the following are common use cases for `app.use()` in Express.js? (Select all that apply)

How would you implement a logging middleware that tracks request processing time?

What is the best practice for handling asynchronous errors in Express.js route handlers?

In Express.js, if you call `next('route')`, it will skip to the next route handler, bypassing remaining middleware in the current route.

What is the benefit of using `express.Router` for organizing routes?

How do you chain multiple middleware functions for a specific route?

Middleware functions can modify both the request and response objects before passing them to the next middleware.

URL parameters defined with a colon (like ':id') must exactly match the parameter name used in `req.params`.

The `express.static()` middleware is suitable for serving dynamic content generated by your application.

Express.js automatically handles CORS without any additional configuration.

Router-level middleware can have its own middleware functions separate from the main application.

Which of the following statements are true about Express.js routing? (Select all that apply)

The `express.json()` middleware automatically validates JSON syntax and will reject invalid JSON.

GET requests in Express.js can access data through `req.body`.

You can use multiple `express.Router` instances in a single Express application.

The order in which middleware is defined in Express.js matters for execution.

Error-handling middleware must be defined before all other middleware and routes in Express.js.

How would you typically handle 404 errors in Express.js?

Which of the following are key features of Express.js? (Select all that apply)

What happens if a middleware function doesn't call `next()` and doesn't send a response?