Client

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.

Note: This feature is only available in Service Workers.

The Client interface represents an executable context such as a Worker, or a SharedWorker. Window clients are represented by the more-specific WindowClient. You can get Client/WindowClient objects from methods such as Clients.matchAll() and Clients.get().

Instance methods

Client.postMessage()

Sends a message to the client.

Instance properties

Client.frameType Read only

The client's frame type as a string. It can be "auxiliary", "top-level", "nested", or "none".

Client.id Read only

The universally unique identifier of the client as a string.

Client.type Read only

The client's type as a string. It can be "window", "worker", or "sharedworker".

Client.url Read only

The URL of the client as a string.

Specifications

Specification
Service Workers
# client-interface

Browser compatibility

Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Client
frameType
id
postMessage
type
url

See also