Accessing localStorage from a webWorker

Web workers only have access to the following:

• XMLHttpRequest
• Application Cache
• Create other web workers
• navigator object
• location object
• setTimeout method
• clearTimeout method
• setInterval method
• clearInterval method
• Performance object (mark,measure,now methods: caniuse?)
• IndexedDB API (see: caniuse?)
• importScripts method
• JSON
• Worker

The window or parent objects are not accessible from a Web worker therefore you can't access the localStorage.

To communicate between window and the workerglobalscope you may use postMessage() function and onmessage event.

Accessing the DOM and window would not be thread safe, since the child thread would have the same privileges as its parent.

No, localStorage and sessionStorage are both undefined in a webworker process.

You would have to call postMessage() back to the Worker's originating code, and have that code store the data in localStorage.

Interestingly, a webworker can use an AJAX call to send/retrieve info to/from a server, so that may open possibilities, depending on what you're trying to do.