API contracts change constantly during development. Fields disappear, types shift, new data appears — and the UI usually finds out only after it's already broken.
API Inspector installs as a DevTools panel that watches every JSON response and flags contract drift the moment it happens, before it turns into a debugging session.
Live DevTools panel: Tracked APIs, statuses, and pending updates in one place.
Automatic extraction: Live JSON turned into structural schemas — no manual contracts.
Field-level diffing: Flags added, removed, and type-changed paths precisely.
Breaking vs minor: Removed or changed fields are breaking; new fields are minor.
Manual approval: Nothing overwrites the saved baseline without review.
Per-origin storage: Every domain keeps its own isolated schema registry.
Outcome
Published on the Chrome Web Store in March 2026, giving frontend developers a local-first way to catch drift before it becomes a harder-to-trace UI bug.