This-Origin Web Storage Inspector

Why this tool needs a live browser context to work at all

Checking localStorage in this context returns 'Storage is not available in this context' -- not a bug, but the expected result when the Web Storage API is queried outside a normal, live browser page context (such as during server-side rendering or a sandboxed evaluation), since localStorage and sessionStorage are browser APIs tied to an actual page origin.

In a real browser tab visiting an actual website, this same check would return the count and names of keys currently stored in that origin's localStorage (or sessionStorage, depending on which is selected) -- the tool works as intended once run in its actual intended environment.

Web Storage is strictly scoped per origin (protocol + domain + port) -- a key stored by one site is never visible to a different site's storage inspection, by browser design, which is a foundational security boundary of the Web Storage API.

What this inspector deliberately doesn't show

Reads this origin only. Values are not printed so secrets stay off the page. This tool shows key names and a count, but deliberately doesn't print the actual stored values -- many sites store session tokens, auth state, or other sensitive data in localStorage, and displaying those values on screen (or in a screenshot, or accidentally shared) would be a real information-exposure risk this design choice avoids.

It only reads the current page's own origin storage -- it has no ability to inspect another site's localStorage, both because browsers don't allow cross-origin access to storage and because this tool doesn't attempt to work around that boundary.

localStorage persists until explicitly cleared (by the site, the user, or a browser storage-clearing action), while sessionStorage clears when the browser tab closes -- selecting the wrong storage type for what you're investigating could show an empty or unexpected result even on a site actively using the other type.

Using this for real debugging

To actually inspect a site's storage, open this tool (or your browser's own DevTools Application/Storage panel) while visiting that site directly, rather than through an embedded or sandboxed context where storage access is restricted.

For inspecting cookies specifically, which follow different scoping and expiration rules than localStorage, the Cookie String Parser is the related tool.

Frequently Asked Questions (FAQ)