FetchEvent: clientId property

The clientId read-only property of the FetchEvent interface returns the id of the Client that the current service worker is controlling.

The Clients.get() method could then be passed this ID to retrieve the associated client.

Value

A string that represents the client ID.

Examples

self.addEventListener("fetch", (event) => {
  console.log(event.clientId);
});

Specifications

Browser compatibility

See also

• Using Service Workers
• Service workers basic code example
• Using web workers