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

app.use

Question 4

What is a middleware?

Answer 4

Express middleware are functions that execute during the lifecycle of a request to the Express server.

Middleware functions are functions that have access to the request object (req), the response object (res), and the next middleware function in the application’s request-response cycle. These functions are used to modify req and res objects for tasks like parsing request bodies, adding response headers, etc.

Question 5

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

Answer 5

Req, res

Question 6

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

Answer 6

application/json

Question 7

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

Answer 7

There is no significance. Developers give the method meaning inside the code block

Question 8

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

Answer 8

Whenever you’re expecting data from the client.