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Class: ServiceWorkers

Class: ServiceWorkers#

Query and receive events from a sessions active service workers.

Process: Main
This class is not exported from the 'electron' module. It is only available as a return value of other methods in the Electron API.

Instances of the ServiceWorkers class are accessed by using serviceWorkers property of a Session.

For example:

const { session } = require('electron')
// Get all service workers.console.log(session.defaultSession.serviceWorkers.getAllRunning())
// Handle logs and get service worker infosession.defaultSession.serviceWorkers.on('console-message', (event, messageDetails) => {  console.log(    'Got service worker message',    messageDetails,    'from',    session.defaultSession.serviceWorkers.getFromVersionID(messageDetails.versionId)  )})

Instance Events#

The following events are available on instances of ServiceWorkers:

Event: 'console-message'#


  • event Event
  • messageDetails Object - Information about the console message
    • message String - The actual console message
    • versionId Number - The version ID of the service worker that sent the log message
    • source String - The type of source for this message. Can be javascript, xml, network, console-api, storage, app-cache, rendering, security, deprecation, worker, violation, intervention, recommendation or other.
    • level Number - The log level, from 0 to 3. In order it matches verbose, info, warning and error.
    • sourceUrl String - The URL the message came from
    • lineNumber Number - The line number of the source that triggered this console message

Emitted when a service worker logs something to the console.

Event: 'registration-completed'#


  • event Event
  • details Object - Information about the registered service worker
    • scope String - The base URL that a service worker is registered for

Emitted when a service worker has been registered. Can occur after a call to navigator.serviceWorker.register('/sw.js') successfully resolves or when a Chrome extension is loaded.

Instance Methods#

The following methods are available on instances of ServiceWorkers:


Returns Record<Number, ServiceWorkerInfo> - A ServiceWorkerInfo object where the keys are the service worker version ID and the values are the information about that service worker.


  • versionId Number

Returns ServiceWorkerInfo - Information about this service worker

If the service worker does not exist or is not running this method will throw an exception.