The SharedWorkerGlobalScope object (the SharedWorker global scope) is accessible through the self keyword. Some additional global functions, namespaces objects, and constructors, not typically associated with the worker global scope, but available on it, are listed in the JavaScript Reference. See the complete list of functions available to workers.

EventTarget WorkerGlobalScope SharedWorkerGlobalScope

Instance properties

This interface inherits properties from the WorkerGlobalScope interface, and its parent EventTarget. Read only

The name that the SharedWorker was (optionally) given when it was created using the SharedWorker() constructor. This is mainly useful for debugging purposes.

Instance properties inherited from WorkerGlobalScope

SharedWorkerGlobalScope.caches Read only

Returns the CacheStorage object associated with the current context. This object enables functionality such as storing assets for offline use, and generating custom responses to requests.

SharedWorkerGlobalScope.console Read only Non-standard

Returns the console associated with the worker.

SharedWorkerGlobalScope.fonts Read only

Returns the FontFaceSet associated with the worker.

SharedWorkerGlobalScope.indexedDB Read only

Provides a mechanism for applications to asynchronously access capabilities of indexed databases; returns an IDBFactory object.

SharedWorkerGlobalScope.isSecureContext Read only

Returns a boolean indicating whether the current context is secure (true) or not (false).

SharedWorkerGlobalScope.location Read only

Returns the WorkerLocation associated with the worker. WorkerLocation is a specific location object, mostly a subset of the Location for browsing scopes, but adapted to workers.

SharedWorkerGlobalScope.navigator Read only

Returns the WorkerNavigator associated with the worker. WorkerNavigator is a specific navigator object, mostly a subset of the Navigator for browsing scopes, but adapted to workers.

SharedWorkerGlobalScope.origin Read only

Returns the global object's origin, serialized as a string.

SharedWorkerGlobalScope.performance Read only

Returns the Performance object associated with the worker, which is a regular performance object, but with a subset of its properties and methods available.

SharedWorkerGlobalScope.scheduler Read only

Returns the Scheduler object associated with the current context. This is the entry point for using the Prioritized Task Scheduling API.


Returns an object reference to the SharedWorkerGlobalScope object itself.

Instance methods

This interface inherits methods from the WorkerGlobalScope interface, and its parent EventTarget.


Discards any tasks queued in the SharedWorkerGlobalScope's event loop, effectively closing this particular scope.

Inherited from WorkerGlobalScope


Decodes a string of data which has been encoded using base-64 encoding.


Creates a base-64 encoded ASCII string from a string of binary data.


Cancels the repeated execution set using setInterval.


Cancels the repeated execution set using setTimeout.

SharedWorkerGlobalScope.dump() Deprecated Non-standard

Writes a message to the console.


Imports one or more scripts into the worker's scope. You can specify as many as you'd like, separated by commas. For example: importScripts('foo.js', 'bar.js');


Schedules the execution of a function every X milliseconds.


Sets a delay for executing a function.


Listen to this event using addEventListener() or by assigning an event listener to the oneventname property of this interface.


Fired on shared workers when a new client connects.


HTML Standard
# shared-workers-and-the-sharedworkerglobalscope-interface

Browser compatibility

BCD tables only load in the browser

See also