Express

Question 1

How do you add express to your package dependencies?

Answer 1

const express = require('express')
const app = express()

Question 2

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

Answer 2

app.listen

Question 3

How do you register a middleware with an Express application?

Answer 3

app.use and pass in a function that takes (req, res, next) parameter

Question 4

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

Answer 4

req, res, next

Question 5

What is the Content-Type header of HTTP requests and responses used for?

Answer 5

How the recipient should handle the body content

Question 6

What does express.static() return?

Answer 6

A middleware function that serves static files

Question 7

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

Answer 7

The directory name of the current module

Question 8

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

Answer 8

Joins the file paths together that are listen as args

Question 9

What is the appropriate Content-Type header for requests and responses that contain JSON in their bodies?

Answer 9

application/json

Question 10

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

Answer 10

express.json() is a method inbuilt in express to recognize the incoming Request Object as a JSON Object. This method is called as a middleware in your application using the code: app.use(express.json());

Question 11

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

Answer 11

So that YOU know what you are trying to do in a function (app.delete would imply that something needs to be deleted)