Express

Question 1

What is NPM?

Answer 1

a package manager where programmers can share their codes

Question 2

What is a package?

Answer 2

a list of modules (package json file)

Question 3

How can you create a package.json with npm?

Answer 3

npm init – yes

Question 4

What is a dependency and how to you add one to a package?

Answer 4

dependency is package that is added to

npm install ____

Question 5

What happens when you add a dependency to a package with npm?

Answer 5

node-module is added to directory and dded to dependencies

Question 6

How do you add express to your package dependencies?

Answer 6

npm install express

Question 7

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

Answer 7

listen()

Question 8

How do you mount a middleware with an Express application?

Answer 8

use()

middleware is processing of requesting and responding

Question 9

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

Answer 9

requires()

Question 10

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

Answer 10

application/json
send() ->JSON.stringify variable and array only
json() ->JSON.stringify variable, array, boolean, null

Question 11

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

Answer 11

automatically parse the json data when the client requests

app.use(express.json())

Question 12

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

Answer 12

path
ex: app.delete(‘path’ , (req, res) => {
})
path = ‘/api/grades/:id’ -> req.params.id

typing after path in command line -> req.body