Web/API/Client/type

The type read-only property of the Client interface indicates the type of client the service worker is controlling.

Syntax

var myClientType = client.type;

Value

A string, representing the client type. The value can be one of

• "window"
• "worker"
• "sharedworker"

Example

// service worker client (e.g. a document)
function sendMessage(message) {
  return new Promise(function(resolve, reject) {
    // note that this is the ServiceWorker.postMessage version
    navigator.serviceWorker.controller.postMessage(message);
    window.serviceWorker.onMessage = function(e) {
      resolve(e.data);
    };
  });
}

// controlling service worker
self.addEventListener("message", function(e) {
  // e.source is a client object
  e.source.postMessage("Hello! Your message was: " + e.data);
  // Let's also post the type value back to the client
  e.source.postMessage(e.source.type);
});

Specifications

Specification	Status	Comment
Service WorkersThe definition of 'type' in that specification.	Working Draft	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
type Experimental'	Chrome Full support 60	Edge Full support ≤79	Firefox Full support 54	IE No support No	Opera Full support 47	Safari No support No	WebView Android Full support 60	Chrome Android Full support 60	Firefox Android Full support 54	Opera Android Full support 44	Safari iOS No support No	Samsung Internet Android Full support 8.0

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

Client.type by Mozilla Contributors is licensed under CC-BY-SA 2.5.