How Can I Extract the Hostname and Path from a URL in JavaScript?

Parsing URL into Hostname and Path in JavaScript

To process a URL string into an object where you can access the hostname and pathname as desired, you can utilize modern solutions or alternative methods.

Modern Approach with URL Object:

The most straightforward solution is to use the URL constructor. It creates an instance of the URL object that provides the properties hostname and pathname. For example:

const a = new URL("http://example.com/aa/bb/");

console.log(a.hostname); // "example.com"
console.log(a.pathname); // "/aa/bb"

Note that hostname contains only the domain, excluding any port information. For both domain and port, you can use host instead.

Alternative Approaches:

If the modern approach is not available, you can consider these alternative methods:

• Regular Expression: Using regular expressions, you can extract the hostname and pathname from the URL string. However, it can be complex and error-prone.
• DOM Parsing: You can create an HTML element, set its href to the URL, and then parse the resulting DOM to retrieve the desired properties. This approach requires browser support and can be slower.

Conclusion:

The modern solution with the URL constructor is the preferred and recommended method for parsing a URL into hostname and pathname in JavaScript.

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