Express

Question 1

How do you add express to your package dependencies?

Answer 1

npm install express

Question 2

What Express application method starts the server and binds it to a network PORT?

Answer 2

listen method

Question 3

How do you mount a middleware with an Express application?

Answer 3

using use() method

Question 4

Which objects does an Express application pass to your middleware to manage the request/response lifecycle of the server?

Answer 4

res and req

Question 5

What is the appropriate Content-Type header for HTTP messages that contain JSON in their bodies?

Answer 5

application/json

Question 6

What does the express.json() middleware do and when would you need it?

Answer 6

the express.json perse the incoming object and attached the object to req.body
perse the incoming json string to a object and attached the object to req.body

Question 7

What is the significance of an HTTP request’s method?

Answer 7

HTTP defines a set of request methods to indicate the desired action to be performed for a given resource.

Question 8

What does express.static() return?

Answer 8

middleware function

Question 9

What is the local __dirname variable in a Node.js module?

Answer 9

The directory name of the current module

Question 10

What does the join() method of Node’s path module do?

Answer 10

The path.join() method joins all given path segments together using the platform-specific separator as a delimiter