URLPattern: hash property

Baseline 2025

Newly available

Since ⁨September 2025⁩, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

Note: This feature is available in Web Workers.

The hash read-only property of the URLPattern interface is a string containing the pattern used to match the fragment part of a URL.

This is the normalized value of the hash pattern passed to the constructor, an inherited value from a baseURL passed to the constructor, or the default value ("*"), which matches any hash.

The below example creates a URLPattern object with books/:id for the hash part and logs the property. This pattern matches any fragment that starts with books/ and ends with an arbitrary string identifier.

const pattern = new URLPattern("https://example.org#books/:id");
console.log(pattern.hash); // 'books/:id'
console.log(pattern.test("https://example.org#books/123")); // true