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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/FetchEvent/clientId below:

FetchEvent: clientId property - Web APIs

FetchEvent: clientId property

Baseline Widely available

Note: This feature is only available in Service Workers.

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

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