Express JS Express Routing

Question 1

Which method defines a route that responds to all HTTP methods in Express?

Accepted Answer

app.all()

Answer

app.all() matches all HTTP methods for a given path.

Question 2

What is the correct way to define a route parameter named 'id' in Express?

Accepted Answer

/user/:id

Answer

Express uses the colon syntax :paramName to define named route parameters.

Question 3

How do you access a route parameter named 'userId' in an Express handler?

Accepted Answer

req.params.userId

Answer

Named route parameters are available on the req.params object.

Question 4

Which Express object is used to create a modular, mountable route handler?

Accepted Answer

express.Router()

Answer

express.Router() creates a mini-application capable of performing middleware and routing functions.

Question 5

How do you mount a router module at the path '/api' in Express?

Accepted Answer

app.use('/api', router)

Answer

app.use() mounts middleware or a router at a specified path prefix.

Express JS Practice Test