express intro

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

Question 3

How do you mount a middleware with an Express application?

Answer 3

app.use([path,] callback [, callback…])

without a path specified, the callback(s) will fire any time the app receives a request

Question 4

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

Answer 4

request (req) and response (res)

Question 5

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

Answer 5

Content-Type: application/json; charset=utf-8

Question 6

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

Answer 6

It tells the server what to do with the information included in the request

Question 7

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

Answer 7

enables your app to parse JSON request bodies