express

Question 1

How do you add express to your package dependencies?

Answer 1

var express = require('express')
var app = 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

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

req (request) and res(response)

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

you can route to different methods

Question 7

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

Answer 7

parses incoming json body of requests and you need it when the client is sending a json body

Question 8

What does express.static() return?

Answer 8

serveStatic middleware function

Question 9

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

Answer 9

returns the path to directory of the current module starting from the root

Question 10

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

Answer 10

joins the specified path segments into one path