Mastering Express Middleware u0026 Routing: A Node.js Quiz Quiz

1. Understanding Middleware Execution Order

   In Express, what determines the order in which middleware functions are executed in your application?

   1. A. The order in which they are defined in your code
   2. B. Alphabetical order of function names
   3. C. Random order every time the server starts
   4. D. The number of parameters in the middleware
   5. E. Whether ‘next()’ is used or not

2. Identifying Valid Middleware Declaration

   Which of the following code snippets correctly declares a custom middleware in Express?

   1. A. app.use(function(req, res, next) { /* logic */ next(); });
   2. B. app.middle(function(res, req, next) { /* logic */ });
   3. C. app.middleware(req, res, next) =u003E { /* logic */ next(); };
   4. D. app.use({req, res, next} =u003E { /* logic */ next() });
   5. E. app.router(function(req, res) { /* logic */ });

3. Best Practice in Route Error Handling

   What is a best practice for handling errors that occur in Express route handlers?

   1. A. Pass the error to next(err) for centralized error handling middleware
   2. B. Return an HTML page with the error message directly from the handler
   3. C. Throw errors and let Node.js crash
   4. D. Ignore the error if it’s minor
   5. E. Return a status code 200 with a custom error message

4. Routing Method Matching in Express

   Given the following code, which HTTP methods will the route respond to?nnapp.route('/user').get(getUser).post(createUser);

   1. A. GET and POST requests only
   2. B. All HTTP methods
   3. C. GET, POST, and PUT
   4. D. Only POST requests
   5. E. Only GET requests

5. Error-Handling Middleware Signature

   Which function signature correctly defines an Express error-handling middleware?

   1. A. function(err, req, res, next)
   2. B. function(req, res, next)
   3. C. function(error, response, request)
   4. D. function(req, res)
   5. E. function(next, err, req, res)