Local-only
Cookie values and event payloads never leave the browser. No server calls, no telemetry on your data.
Chrome DevTools extensions
Focused lenses for everyday web debugging.
Focused Chrome DevTools extensions for everyday web debugging.
Products
Three extensions, one design language. Pick the lens that fits the problem in front of you.
Cookie Lens
Inspect, edit, freeze, and audit browser cookies.
A popup and a DevTools panel for engineers debugging session, auth, consent, and tracking cookies.
- Decode JWT, JSON, Base64 & key/value inline
- Freeze cookies and switch named Profiles
- Activity feed, Diff & a security Report
Open documentation
Header Lens
Coming to the Web StoreSet, override and remove HTTP headers per site.
A popup, a DevTools panel and a side panel for engineers testing auth, feature flags, locales, caching and CORS — rules run as declarativeNetRequest rules and never leave your device.
- Set, append or remove request & response headers
- Scoped per site, first-party by default, pausable
- Presets, Profiles, import/export, credential care
Open documentation
Event Lens
In developmentA single timeline for every event your app emits.
Capture analytics calls, custom DOM events, postMessage traffic, and runtime event-bus traffic in one place. Currently in development — not yet on the Chrome Web Store.
- Ordered timeline with payload inspection
- Structural diff against previous events
- Filter, search, copy, export reproductions
How the Lens family works
Three principles every tool in the family follows.
DevTools-native
Every tool ships as a Chrome DevTools panel — open it where you already debug, with the same shortcuts.
Focused, not bloated
Each Lens does one thing well. Small surface area, fast to learn, predictable to use.