make localStorage or sessionStorage expire like cookies [duplicate]

Answer 1

The Storage model was meant to be a cache for scripts; not of a spur-of-the-moment data holder. Infact sessionStorage should clear as soon as the protocol+domain is navigated away from. With that said, the simplest way would be to store and check a 'hold-until' value at each page view, and update/clear-storage it as needed

Answer 2

The best you can do is to set a timestamp in storage, and if the user visits your site after a specified amount of time, then you can delete the stored data.

sessionStorage should work the same way, except when it doesn't even last long enough for your timed expiration. In that case, it'll expire sooner.