How to get domain name from URL in JavaScript?

Product Support LT Browser
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#1

How can I extract the hostname from a string in JavaScript?

I want to match just the root of a URL and not the entire URL from a text string. For example, given the following URLs:

http://www.example.com/12xy45 http://example.com/random I would like to extract the last two instances, resulting in www.example.com and example.com.

I’ve heard that regex can be slow, and since this would be my second regex expression on the page, I am open to alternatives. Can you provide a JavaScript/jQuery solution for javascript get domain from url without using regex?

#2

Hello!

I hope you’re doing well. I wanted to share a helpful method for extracting hostnames from URLs using the URL constructor in JavaScript. This approach simplifies the process and ensures you get the root domain effectively. Here’s a concise function that demonstrates this:

function getDomain(url) {
    try {
        const parsedUrl = new URL(url);
        return parsedUrl.hostname; // This will return the root domain
    } catch (error) {
        console.error('Invalid URL:', error);
        return null;
    }
}

// Example usage
const urls = [
    "http://www.youtube.com/watch?v=ClkQA2Lb_iE",
    "http://youtu.be/ClkQA2Lb_iE",
    "http://www.example.com/12xy45",
    "http://example.com/random"
];

const domains = urls.map(getDomain).filter(domain => domain.includes("example.com"));
console.log(domains); // Outputs: [ 'www.example.com', 'example.com' ]

In this code, we create a function getDomain that takes a URL string, parses it, and returns the hostname. In the example usage, we filter the domains to include only those that contain “example.com”.

Feel free to implement this in your projects!

Best regards!

#3

Hello!

I hope this message finds you well.

To extract the domain from a URL, you can effectively use the split method. Here’s a concise way to achieve this:

function getDomainFromSplit(url) {
    const urlParts = url.split('/'); // Split the URL by '/'
    if (urlParts.length > 2) {
        return urlParts[2]; // The hostname is the third part
    }
    return null;
}

// Example usage
const domainsFromSplit = urls.map(getDomainFromSplit).filter(domain => domain.includes("example.com"));
console.log(domainsFromSplit); // Outputs: [ 'www.example.com', 'example.com' ]

This function splits the URL string and retrieves the hostname, ensuring you’re working with valid URLs. If you have any questions or need further clarification, feel free to ask!

Best regards.

#4

Hello there!

When working in a browser context, utilizing the location object can greatly enhance your ability to manipulate and extract information from URLs. Here’s a simple yet effective function that demonstrates how to retrieve the domain from a given URL:

function getDomainFromLocation(url) {
    const a = document.createElement('a'); // Create an anchor element
    a.href = url; // Assign the URL to the href property
    return a.hostname; // Return the hostname
}

// Example usage
const domainsFromLocation = urls.map(getDomainFromLocation).filter(domain => domain.includes("example.com"));
console.log(domainsFromLocation); // Outputs: [ 'www.example.com', 'example.com' ]

This function creates an anchor element, assigns the provided URL to it, and then extracts the hostname, allowing for efficient domain filtering.

Feel free to reach out if you have any questions or need further assistance!

Thanks!