Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The URLPattern() constructor returns a new URLPattern object representing the url pattern defined by the parameters.

Note: This feature is available in Web Workers


new URLPattern(input)
new URLPattern(input, baseURL)



The pattern that will be used for matching. This can either be a string, or an object providing patterns for each URL part individually. The object members can be any of protocol, username, password, hostname, port, pathname, search, hash, or baseURL. Omitted parts in the object will be treated as wildcards (*).

baseURL Optional

A string representing the base URL to use in cases where input is a relative pattern. If not specified, it defaults to undefined.



Indicates one of the following:

  • The given pattern or base URL is not valid or syntactically correct.
  • A baseURL is provided, and input is an absolute pattern or a structured object.


// Matching a pathname
let pattern1 = new URLPattern('https://example.com/books/:id')
// same as
let pattern2 = new URLPattern(
// or
let pattern3 = new URLPattern({
  protocol: 'https',
  hostname: 'example.com',
  pathname: '/books/:id',
// or
let pattern4 = new URLPattern({
  pathname: '/books/:id',
  baseURL: 'https://example.com',
// Match the protocol and hostname
let pattern = new URLPattern({
  protocol: 'http{s}?',
  hostname: ':subdomain.example.com',
// Match all possible structured parts
let pattern = new URLPattern({
  protocol: 'http{s}?',
  username: ':username',
  password: ':password',
  hostname: ':subdomain.example.com',
  port: ':port(80|443)',
  pathname: '/:path',
  search: '*',
  hash: '*',

Usage notes

The URLPattern constructor has two forms. The constructor either takes a pattern object, or a pattern string and optional baseURL.

new URLPattern(obj);
new URLPattern(pattern);
new URLPattern(pattern, baseURL);

The first type of constructor (see above) takes an object that describes the URLs that should be matched by specifying patterns for each individual URL part. Its members can be any of protocol, username, password, hostname, port, pathname, search, hash, or baseURL. If the baseURL property is provided it will be parsed as a URL and used to populate any other properties that are missing. If the baseURL property is missing, then any other missing properties default to the pattern * wildcard, accepting any input.

The second type of constructor (see above) takes a URL string that contains patterns embedded in it. The URL string may be relative if a base URL is provided as the second argument. Note, it may be necessary to escape some characters in the URL string where its ambiguous whether the character is separating different URL components or if it's instead part of a pattern. For example, you must write about\\:blank to indicate that the : is the protocol suffix and not the start of a :blank named group pattern.


URLPattern API
# dom-urlpattern-urlpattern

Browser compatibility

BCD tables only load in the browser

See also

  • A polyfill of URLPattern is available on GitHub