CookieStoreManager: subscribe() method

The subscribe() method of the CookieStoreManager interface subscribes a ServiceWorkerRegistration to cookie change events.

Duplicate subscriptions are ignored: that is, if a service worker subscribes more than once to the same cookie, it will only receive each change notification once.

Syntax

subscribe(subscriptions)

Parameters

subscriptions

An array of objects, each of which has the following properties:

name Optional

A string equal to the name of a cookie. If name is omitted, the service worker is subscribed to change events for all cookies that are in scope.

url Optional

A string equal to the URL of a cookie scope. This may be narrower than the scope of the service worker registration. If url is omitted, it defaults to the scope of the service worker registration.

Return value

A Promise that resolves with undefined when the subscription completes.

Exceptions

TypeError

Thrown if the url is not a valid URL, or doesn't start with the service worker registration's scope.

Examples

Setting name and URL

In this example, the ServiceWorkerRegistration represented by registration is subscribing to change events on the cookie named "cookie1" with a scope of "/path1".

// Subscribe to a specific cookie and URL
const subscriptions = [{ name: "cookie1", url: `/path1` }];
await registration.cookies.subscribe(subscriptions);

Setting name only

In this example, we set only name and omit url: the subscription applies to all cookies named cookie1 within the service worker's scope.

// Subscribe to all cookies named "cookie1" in the registration scope
await registration.cookies.subscribe([{ name: "cookie1" }]);

Setting URL only

In this example we set only url, and omit name: the subscription applies to all cookies within the specified URL scope.

// Subscribe to all cookie changes within a specific path
await registration.cookies.subscribe([{ url: "/path/one/" }]);

Subscribing to all cookies

In this example, both name and url are omitted. The subscription applies to all cookies within the service worker's scope.

// Subscribe to all cookie changes within the entire registration scope
await registration.cookies.subscribe([{}]);

Setting a URL outside the service worker's scope

If the URL is outside the service worker's scope, subscribe() will throw a TypeError.

await registration.cookies.subscribe([
  { name: "cookie1", url: "/out-of-scope/" },
]);

Specifications

• Cookie Store API