When do items in HTML5 local storage expire?

html, javascript, local-storage

Solution

It's not possible to specify expiration. It's completely up to the user.

https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage

Of course, it's possible that something your application stores on the client may not be there later. The user can explicitly get rid of local storage, or the browser may run into space considerations. It's good to program defensively. Generally however things remain "forever" based on some practical definition of that word.

edit — obviously, your own application can actively remove stuff if it decides it's too old. That is, you can explicitly include some sort of timestamp in what you've got saved, and then use that later to decide whether or not information should be flushed.

Problem

Original source