Express JS Express Routing 3

Question 1

What is the purpose of router.param() in Express?

Accepted Answer

Adds a callback triggered when a specific route parameter is present

Answer

router.param() registers a callback that runs whenever a specific named parameter appears in a route.

Question 2

Which HTTP method does app.delete() handle in Express?

Accepted Answer

DELETE

Answer

app.delete() registers a route handler for the HTTP DELETE method.

Question 3

How can you define multiple callback functions for a single route in Express?

Accepted Answer

Pass them as multiple arguments or an array to app.get()

Answer

Express allows passing multiple middleware functions as separate arguments or in an array to route methods.

Question 4

What does express.Router() return?

Accepted Answer

A mini Express application / isolated router instance

Answer

express.Router() returns an isolated router instance that acts like a mini-app with its own middleware and routes.

Question 5

In Express routing, what does the path '/' represent?

Accepted Answer

The root path of the application or mounted router

Answer

The path '/' refers to the root of the application or the mount point if it's a sub-router.

Express JS Practice Test