WindowSharedStorage: run() method

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The run() method of the WindowSharedStorage interface executes a run operation that is registered in a module added to the current origin's SharedStorageWorklet.

Note: The Run output gate is intended as a generic way to process some shared storage data.


run(name, options)



A string representing the registered operation's name within the shared storage worklet module. It must match the name given to the operation when it is registered with SharedStorageWorkletGlobalScope.register().

options Optional

An options object that can contain the following properties:

data Optional

An object representing any data required for executing the operation.

keepAlive Optional

A boolean value. If set to true, the SharedStorageWorkletGlobalScope of the associated worklet is kept alive, and the operation can be run again. Therefore, you need to set keepAlive to true for each operation that is not intended to be the last one. The default value, false, means that the SharedStorageWorkletGlobalScope is terminated after the operation is run and cannot be run again.

Return value

A Promise that fulfills with undefined.



Thrown if:

  • The worklet module has not yet been added with addModule().
  • Shared storage is disabled (for example via a browser setting).
  • The calling site does not have the Shared Storage API included in a successful privacy sandbox enrollment process.


async function measureUniqueReach() {
  // Load the Shared Storage worklet
  await window.sharedStorage.worklet.addModule("reach-measurement-worklet.js");

  // Run the reach measurement operation
  await"reach-measurement", {
    data: { contentId: "1234" },


See Unique reach measurement for a full explanation of this example. See Shared Storage API for more examples.


Shared Storage API
# dom-windowsharedstorage-run

Browser compatibility

BCD tables only load in the browser

See also