How to extract the host name from URL using JavaScript ?

To extract the hostname portion from a URL, we can use the location object that represents information about the current URL. It is the element of the window object and a client-side object.

Syntax:

window.location.propertyname

Example 1: In this example, we will use the self URL, where the code will run to extract the hostname.

Program:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title> 
        Get domain from URL 
    </title> 
</head> 
  
<body> 
    <h1 style="color: green">  
        GeeksforGeeks  
    </h1> 
      
    <b>URL is:</b>  
      
    <script> 
        document.write(window.location.href); 
    </script> 
          
    <br> 
    <b>hostname is:</b>  
      
    <script> 
        document.write(window.location.hostname); 
    </script> 
</body> 
  
</html> 

Output:

Example 2: In this example, we will ask for the URL to the user and then will perform the extraction of hostname on that URL.

Program:

<!DOCTYPE html> 
<html> 
  
<head> 
    <title>Extracting URL</title> 
</head> 
  
<body> 
    <h1 style="color: green;">GeeksforGeeks</h1> 
    <b>Extracting URL</b> 
    <br><br> 
    <form name="f1"> 
        <input type="text" name="txt" 
               placeholder="Paste URL"/> 
        <input type="button" value="click" 
               onclick="url2()" /> 
    </form> 
    <script> 
        function url2() { 
  
            var url3 = document.f1.txt.value; 
  
            var j = url3.indexOf("://"); 
  
            var host = ""; 
  
            for (i = j + 3; i < url3.length; i++) { 
                if (url3.charAt(i) != '/') { 
                    host = host + "" + url3.charAt(i); 
                } else { 
                    break; 
                } 
            } 
            document.write(host); 
        } 
    </script> 
</body> 
  
</html> 

Output:

My Personal Notes

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