The window.location Object
const domain = window.location.hostname;
console.log(domain); // Output: “example.com”
The URL Object
const url = new URL(“http://www.example.com/pathname/?search=test#hash”);
const domain = url.hostname;
console.log(domain); // Output: “www.example.com”
If you need more control over how the domain is extracted from a URL, you can use regular expressions (regex). Here’s an example that uses regex to extract the domain:
const url = “http://www.example.com/pathname/?search=test#hash”;
const domain = url.match(/^(?:https?:\/\/)?(?:[^@\n]+@)?(?:www\.)?([^:\/\n]+)/im);
console.log(domain); // Output: “example.com”
The first method we can use is
location.hostname. This method returns the domain name of the current webpage, so it’s perfect if you need to extract the domain of the page the user is currently on:
const currentDomain = window.location.hostname;
If you need to extract the domain name from a URL string, you can use the
URL constructor along with the
const url = new URL('https://www.example.com/path/to/page.html'); const domain = url.hostname;
This method works well for URLs that include the protocol (http or https) and the path, but it does require parsing the URL string.
If you only have the domain name as a string, you can use the
split method along with the
indexOf method to extract the domain name:
const url = 'www.example.com'; const domain = url.split('.').slice(-2).join('.');
This method splits the domain name using the period as a delimiter, then selects the last two elements (which should be the second-level domain and the top-level domain), and finally joins them back together with a period.
hrefand others that can be used to extract URL domain. For example, to extract the domain from the current URL, you can use the following code:
let domain = location.hostname; console.log(domain);
let url = 'https://www.example.com/myfile.html'; let domain = url.match(/^(?:https?:\/\/)?(?:[^@\n]+@)?(?:www\.)?([^:\/\n?]+)/img); console.log(domain);
Understanding Regex Patterns for Efficient URL Domain Extraction
The following regex pattern can be used for extracting the domain name from a given URL:
This pattern checks whether the URL starts with “http://” or “https://”, and then extracts the domain name following it. It also takes into account the “www.” prefix in domain names.
Using a regex pattern for extracting the domain name is much more efficient than splitting the URL into an array and checking for all possible domain prefixes. It is also much more accurate, since it can handle URL variations like subdomains and different top-level domains.
By understanding and using regex patterns, developers can improve the efficiency and accuracy of their URL domain extraction methods.
Another popular library for URL parsing is parseuri.js. This library is lightweight and easy to use, and can be used both in the browser and in Node.js. It provides a simple interface for parsing URLs into their component parts, and also supports modifying and serializing URLs.
Common Use Cases for URL Domain Extraction in Web Development
URLs (Uniform Resource Locators) are strings that specify the location of a resource on the internet. In web development, it is often necessary to extract various information from a given URL. One of the most commonly required pieces of information is the domain name.
Here are some common use cases for URL domain extraction:
- Content categorization: Websites often categorize their content based on the domain name of the URLs. For example, a news website may categorize its articles into different sections based on which news agency it was sourced from.
- Analytics: URL domain extraction is useful for web analytics. Tracking website traffic from different domains can provide useful insights for website owners and marketers.
- Security: Checking the domain name against a blacklist or whitelist can help prevent security issues such as phishing attacks.
- Geolocation: Some websites offer different content or services based on the user’s geographic location. Extracting the domain name can help identify the user’s country and city.
// Get the domain name of the current page const domain = location.hostname; console.log(domain); // Outputs "example.com"
- Use a regular expression to extract the domain from the URL. This is the most reliable and efficient way to do it.
- Include error handling in case the URL is not in the correct format or if there is an issue with the regular expression.
- Consider using a library such as tldjs for more advanced domain extraction capabilities, such as parsing subdomains.
- Test your code thoroughly to ensure that it is working correctly and efficiently.