npm

Question 1

What is NPM?

Answer 1

Node package manager - a way to reuse/use code from other developers and also to share your code, which makes it easy to manage the different versions of code

1. website
2. the Command Line Interface (CLI)
3. the registry
4. Use the website to discover packages, set up profiles, and manage other aspects of your npm experience. For example, you can set up organizations to manage access to public or private packages.
5. The CLI runs from a terminal, and is how most developers interact with npm.
6. The registry is a large public database of JavaScript software and the meta-information surrounding it.

Question 2

What is a package?

Answer 2

a directory with one or more files and it contains the file package.json

Question 3

How can you create a package.json with npm?

Answer 3

1. go to the root directory of the package.

2. npm init –yes

Question 4

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

Answer 4

Packages required by your application in production.

You can add to a package by “npm install (package-name)”

Question 5

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

Answer 5

the dependency key will be listed in the package’s package.json file

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( ) method

Question 8

How do you mount a middleware with an Express application?

Answer 8

the use( ) method

Question 9

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

Answer 9

request object (req)
 response object (res)

Question 10

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

Answer 10

application/JSON

Question 11

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

Answer 11

It determines the different actions that can be done depending on the method.

Question 12

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

Answer 12

It parses incoming requests with JSON payloads and returns the object containing parsed data on req.body.
You would need it when your app needs to parse JSON request bodies.

Question 13

What is Webpack?

Answer 13

webpack bundles your JS application by automatically building your dependency graph based on what is imported and exported

Question 14

How do you add a devDependency to a package?

Answer 14

–save-dev

example:
npm install –save-dev

Question 15

What is an NPM script?

Answer 15

it is a property of package.json and can be executed by running npm run; CLI command you can run

Question 16

How do you execute Webpack with npm run?

Answer 16

npm run build — where build is the property of scripts with the value “webpack”

can change word build but will have to change in the command line too.

Question 17

What does express.static() return?

Answer 17

returns middleware function

Question 18

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

Answer 18

The directory name of the current module.

Question 19

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

Answer 19

The path.join() method joins all given path segments together using the platform-specific separator as a delimiter, then normalizes the resulting path.

Question 20

Serving static files in Express

Answer 20

To serve static files such as images, CSS files, and JavaScript files, use the express.static built-in middleware function in Express.