URL class for parsing in Node.js - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the URL class in Node.js?

The URL class helps to easily parse, manipulate, and format URLs by breaking them into parts like protocol, hostname, pathname, query, and more.

beginner

How do you create a new URL object for parsing a web address?

Use the syntax: <code>const myUrl = new URL('https://example.com/path?name=value');</code> This creates an object representing the URL.

beginner

Which property of the URL object gives you the domain name?

The hostname property returns the domain name part of the URL, like 'example.com'.

intermediate

How can you access the query parameters from a URL object?

Use the searchParams property, which provides methods like get() to read query parameters easily.

beginner

What method would you use to convert a URL object back to a string?

Use the toString() method or simply use the URL object in a string context to get the full URL string.

Which property of the URL object contains the path after the domain?

A search

B protocol

C pathname

D host

The pathname property holds the path part of the URL, like '/path/to/page'.

How do you get the value of a query parameter named 'id' from a URL object?

A url.query.id

B url.searchParams.get('id')

C url.get('id')

D url.params.id

Use searchParams.get('id') to retrieve the value of the 'id' query parameter.

What will new URL('https://example.com:8080').port return?

A 8080

B 'https'

C '' (empty string)

D 'example.com'

The port property returns the port number specified in the URL, here '8080'.

Which constructor is used to create a URL object in Node.js?

A new URL()

B new UrlParser()

C URL.parse()

D url.create()

The standard way is to use new URL() to create a URL object.

If you want to change the protocol of a URL object, which property do you modify?

A href

B host

C pathname

D protocol

The protocol property holds the scheme like 'http:' or 'https:' and can be changed.

Explain how to parse a URL string and access its hostname and pathname using the URL class.

Think about creating a new URL and then reading its parts.

Describe how to read and modify query parameters using the URL class in Node.js.

Focus on the searchParams methods.