What is an URL?
A URL is another name for a web address. For instance, a word-based URL is Javatpoint.com. A URL can also be created using an IP address (ex. 192.168.2.24). Most consumers provide the name's address when conducting an online search because names are easier to remember than numbers.
Web browsers use URLs to ask web servers for particular pages. Below is a list of a URL's syntax and format.
The type of Internet service is specified (http or https is being used in general).
It establishes a domain prefix (www is the default for http).
It discusses the domain name on the internet (ex. javatpoint.com).
It identifies the port on the host (80 is the default for http).
It creates a path on the server side.
It identifies a resource's or document's name.
1. Using the window.location object
This approach has the advantage of being simple and reliable. However, it only works for the current URL, so if you need to extract the domain name from a different URL, you'll need to use a different method.
2. Using the URL constructor
The URL constructor has the advantage of being able to extract the domain name from any valid URL, not just the current one. However, it's only available in modern browsers, so you'll need to check if it's supported before using it.
3. Using regular expressions
This regular expression pattern matches the domain name in a URL, ignoring the protocol (http or https), username and password, and path. It works by looking for the first occurrence of a sequence of characters that doesn't include a colon, a slash, or a newline, preceded by an optional protocol, username and password, and optional "www." prefix. The match method returns an array containing the entire match and any captured groups, so we need to extract the second item (at index 1) to get the domain name.
This approach has the advantage of being flexible and adaptable to different URL formats, but it's also more complex and prone to errors if the regular expression pattern is not precise enough.
4. Using the DOM
This approach has the advantage of being easy to understand and implement, but it also creates a DOM element, which may have some performance implications if you need to do this repeatedly.