Express Intro, Middleware, Get/Delete/Post JSON

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

app.listen(path, [callback])

Question 3

How do you mount a middleware with an Express application?

Answer 3

By app.use()

Question 4

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

Answer 4

Request object, response object

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 is the significance of an HTTP request’s method?

Answer 6

Is arbitrary. It makes it more specific for the client to show the server what the client is wants to do.

Question 7

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

Answer 7

It parses the incoming requests object.

It is needed when you need to parse the request bodies that are JSON.