Unused JSON fields
See which response fields were returned by an API but never read by the UI during the session.
Chrome DevTools extension
Find the API data your UI never uses.
Overfetch observes runtime API responses locally, tracks which JSON fields the interface actually touches, and turns payload bloat into a focused cleanup report.
You are overfetching1.30 MB wasted across 6 API calls
Payload returned2.57 MB
UI actually used1.28 MB
Waste found50%
GET /api/lead97% unused
GET /api/workspaces76% unused
POST /api/validate61% unused
One narrow purpose: analyze API payload usage for the site you are inspecting.
What it reports
Payload answers without packet-by-packet guesswork.
Duplicate API calls
Spot repeated requests and understand when duplicated payloads inflate frontend work.
Endpoint waste ranking
Sort requests by payload waste so cleanup starts with the endpoint that matters most.
Workflow
Made for local debugging and production inspection.
01Open DevTools
02Browse your app
03Inspect API waste
04Ship smaller payloads
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