State Mover Autor: Animesh Singh

State Mover is a focused browser extension built to help you transfer selected website storage data from one page to another with clarity and control. Its purpose is centered on two browser storage areas commonly used by web applications: localStorage and sessionStorage. Rather than copying everything blindly, it gives you a compact interface for reviewing what is available on the active page, choosing the exact keys you want, exporting them as a structured snapshot, and importing that snapshot into another page when needed.

When opened on a supported page, the extension reads the active tab, identifies the current origin, and scans for both localStorage and sessionStorage entries. These are presented in separate tabs so you can work with each storage area independently. The interface also shows how many keys exist in each section, helping you quickly understand how much browser-side state a site is currently using. This makes the extension especially practical for testing, troubleshooting, development workflows, session reproduction, or moving specific settings and application state between environments.

A key strength of State Mover is selective control. You can filter keys by name, choose entries with checkboxes, select all matching items, or clear the selection and start again. The extension does not force a full export if you only need a few specific values such as a session token, a feature-flag object, or saved UI preferences. It also displays the size of each stored value, giving you better visibility into what is being moved and how large a snapshot may be.

For closer inspection, individual entries can be previewed before export or import. If a value contains JSON, the extension formats it for easier reading. This makes it easier to verify what a key contains before you move it. Based on the provided package description, values are surfaced for inspection and export through the extension interface, while key names and sizes help you browse efficiently.

State Mover supports two export methods. You can copy the selected snapshot directly to the clipboard as JSON, or download it as a JSON file for later use. The snapshot includes metadata such as source origin, export timestamp, and version information, along with the selected localStorage and sessionStorage values. On the import side, you can paste JSON text into the extension or load a saved JSON file, then apply it to the current page’s storage. There is also an option to reload the page automatically after import so the site can immediately use the updated state.

The extension also remembers key selections per origin using extension storage, which is useful if you repeatedly work with the same sites. Compatibility handling for older stored selection formats and earlier snapshot formats is included as well, helping maintain continuity across versions.

Its behavior is intentionally limited to standard http and https pages. It does not run on browser-internal pages, extension pages, add-on stores, developer tools pages, view-source pages, or local file pages. If a page cannot be accessed, storage is blocked, or writing fails because of quota or related issues, the extension shows an error instead of failing silently. Overall, State Mover is designed for visibility, precision, and convenience when moving selected browser-side web app state.

Key Features:
- Reads both localStorage and sessionStorage from the active page and shows them in separate tabs.
- Displays the current origin and counts how many keys exist in each storage area.
- Lets you filter keys by name and use checkboxes to select exactly which entries to move.
- Supports per-key preview so you can inspect stored values, with JSON formatted for easier reading when applicable.
- Shows value sizes to help you understand the amount of data included in a snapshot.
- Exports selected data as a JSON snapshot that can be copied to the clipboard or downloaded as a file.
- Imports snapshots from pasted JSON text or a JSON file and can optionally reload the page after applying them.

How It Works:
1. Open State Mover on an active http or https page and let it scan the page’s localStorage and sessionStorage.
2. Switch between the storage tabs to review available keys for the current origin.
3. Use the filter box, checkboxes, and all or none controls to choose the specific keys you want.
4. Preview individual values if needed to confirm their contents before moving them.
5. Export the selected state by copying a JSON snapshot to the clipboard or downloading it as a JSON file.
6. On another page, paste the snapshot into the import area or load the saved file.
7. Apply the snapshot to write those values into the current page’s storage, then reload the page if desired.

Privacy: - This extension stores your key selections in extension storage so it can remember choices per origin. It also requests clipboard write access to copy exported snapshots. The provided package description shows that it reads and writes localStorage and sessionStorage data on the active page you choose to use it on. No explicit external data collection behavior is described in the provided information.