API Watchtower

About

API Watchtower helps QA engineers, developers, and SREs validate backend behavior while testing the UI.

Start recording, run your normal UI flow, then stop recording. API Watchtower generates a downloadable HTML report that shows what happened across your API traffic so you can quickly spot performance issues and failures.

What it does:

Captures HTTP/HTTPS requests during your test session
Highlights slowest calls and endpoint latency hotspots
Breaks down 4xx, 5xx, and network failures
Groups calls by page URL so you can see where each call happened
Supports base URL filters to focus on selected services only
Provides sortable/filterable report tables for fast triage
Optionally captures request payload snapshots for 4xx/5xx calls (size-capped)
Why install it:

Debug UI + API behavior in one workflow
Find regressions faster without manual Network tab digging
Share one clear report with frontend/backend teams
Improve test evidence quality for release validation
Privacy-first behavior:

Report is generated locally in your browser session
No external upload is required by default
Payload capture is optional and intended for error troubleshooting only