Node.js

Question 1

What is the purpose of module.exports in a Node.js module?

Answer 1

To export data from 1 js file to another

Question 2

How do you import functionality into a Node.js module from another Node.js module?

Answer 2

require();

Question 3

What is the javaScript Event Loop?

Answer 3

design pattern that waits for and dispatches events or messages

Question 4

What is the different between blocking and non-blocking with respect to how code is executed?

Answer 4

blocking doesn’t allow other functions to execute

non-blocking does

Question 5

What is a directory?

Answer 5

folder, collection of files

Question 6

What is a relative file path?

Answer 6

paths relative to the current working directory

Question 7

What is an absolute file path?

Answer 7

Complete directory list

Question 8

What module does Node.js include for manipulating the file system?

Answer 8

File System

Question 9

What method is available in the Node.js fs module for writing data to a file?

Answer 9

fs.writeFile

Question 10

Are file operations using the fs module synchronus or asynchronous?

Answer 10

async

Question 11

What is a client?

Answer 11

Request and receive services from a server

Question 12

What is a server?

Answer 12

Provides functions or services

Question 13

Which HTTP method does a browser issue to a web server when you visit a URL

Answer 13

GET

Question 14

What is the first line of an HTTP request message?

Answer 14

Start line

http method

Question 15

What is on the first line of an HTTP response message?

Answer 15

start-line

http method, status

Question 16

What are HTTP headers?

Answer 16

additional information passed with an HTTP request

Question 17

Is a body required for a valid HTTP message?

Answer 17

no

Question 18

What is NPM?

Answer 18

Node Package Manager, provides hosting for packages

Question 19

What is a package?

Answer 19

file or directory containing Node modules

Question 20

How can you create a package.json with npm?

Answer 20

init

Question 21

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

Answer 21

dependencies are packages required by your app.

They must be listed as a dependency in the package.json. Can use npm i

Question 22

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

Answer 22

the dependency is downloaded and saved to the package.json

Question 23

How do you add express to your package dependencies?

Answer 23

npm i express

Question 24

What express application method starts the server and binds it to a network port?

Answer 24

listen

Question 25

How do you mount a middleware with an express application?

Answer 25

use method

Question 26

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

Answer 26

request and response

Question 27

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

Answer 27

application/json

Question 28

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

Answer 28

Indicate the desired action. I could use the same path, but have different functions based on the request method

Question 29

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

Answer 29

It parses request with json objects. When receiving json objects