Website Change Tracker

Register URLs for on-demand and Cron-scheduled snapshots. Rendered text is stored in R2, content hashes and diff summaries in D1. View change history per tracked URL.

Features

POST /track - register a URL
DELETE /track?url= - unregister
GET /history?url= - snapshot diff history
Scheduled handler every 30 minutes for tracked URLs

API Reference

POST /track

{ "url": "https://example.com" }

DELETE /track?url=

Unregister a tracked URL.

GET /history?url=

Return snapshot history with content hashes and diff summaries.

Error Codes

400 - INVALID_URL, INVALID_BODY
404 - NOT_TRACKED

Use Cases

Monitor marketing or legal pages for unexpected content changes
Learn R2 + D1 + Cron + Browser Rendering together
Prototype change-detection alerts before production hardening

Limitations

Requires D1, R2, Browser Rendering, and Cron bindings
Diff summary is line-based heuristic, not semantic
30-minute cron interval; not real-time

Deployment

Click the deploy button

Configure bindings

D1 DB, R2 SNAPSHOTS, Browser BROWSER, cron */30 * * * *. Run D1 migrations before deploy.

Test your deployment

See the experiment README for curl examples.

Local Development

cd apps/experiments/website-change-tracker
npm install
npm run dev

Configuration