Browser Data Studio

Browser Data Studio is a local-first browser data workbench. After opening any regular website, you can view and manage the site's Cookie, LocalStorage, and SessionStorage data directly from the Chrome side panel. Main features: • Cookie management: view, search, add, edit, delete, and clear cookies with full support for HttpOnly, Secure, and SameSite attributes. Editing includes expiry presets (+1 hour, +1 day, +1 week, session). • Storage management: read and write the current page's LocalStorage and SessionStorage. • JWT & tokens: automatically detects common token keys, parses JWT headers, payloads, standard claims and remaining lifetime; copy as Authorization: Bearer, curl command, or JS snippet. Note: local parsing does not verify the signature. • Smart classification: JSON, Base64, numbers, booleans and strings are detected automatically; format JSON and encode/decode Base64 with one click. • Security-first: read-only by default, editing requires unlocking; extra warning on production hosts; sensitive values are masked by default and require confirmation before copying; exported JSON is redacted automatically. • Snapshots & undo: snapshots are saved automatically before each change; undo with a field-level diff preview; snapshots can be exported and imported with a risk warning. • Batch & search: regex / case-sensitive search, column sorting, token-only filter, batch select delete/copy. • Context awareness: environment card (UA / timezone / viewport / language / incognito) and site statistics card (counts, token count, total size). • Utilities: copy current section as JSON, export site cookies as curl, value change watcher, light/dark theme toggle, keyboard shortcuts. • 11 languages: follows browser language and allows manual switching. Privacy & security: • All data is processed locally in your browser; no website data is collected or uploaded. • No analytics/advertising SDKs, no remote scripts loaded, no data sent to any server. • No site permissions are requested on install; the extension only operates after you grant access to the current site. • Snapshots are stored locally and expire automatically after 7 days.