Phase 7: Shipping · 20 min · Vercel · Netlify · Supabase
Post-Launch Monitoring
Launching is the beginning, not the end. What you do after launch determines if the app survives.
Hiring signal: What changes when you use this: you can monitor and respond to issues after launch — which means you can maintain a live app.
What you will learn
- Check for errors in the browser console after launch
- Monitor Supabase logs for database and auth issues
- Collect and prioritize user feedback
- Roll back a deployment when things break
- Know when to fix forward vs. when to roll back
Your Mission
Check your live app for errors, test on multiple environments, and practice the rollback process. Output: monitoring_notes.md.
You need: A deployed app with real users (or at least yourself testing).
Time: 25 minutes.
Step 1: Check the Browser Console (5 min)
Open your live site and check the browser console (Cmd+Option+J on Mac, F12 on Windows).
Look for:
- Red errors — JavaScript errors, failed network requests, missing resources
- Yellow warnings — deprecated APIs, performance issues
- Failed network requests — API calls returning 4xx or 5xx
The 'it works on my machine' trap
Just because the app works on your machine doesn't mean it works for everyone. Different browsers, network conditions, devices, data — all can cause issues you didn't see locally. After launch, test on: (1) a different browser, (2) a mobile device, (3) a slow network, (4) with real data. Monitoring catches what you can't test.
Write in your file:
Unlock the full lesson
You've read the first 2 sections. The rest of this lesson covers Browser Console Check, Step 2: Check Supabase Logs (5 min), Supabase Logs, Step 3: Test on Multiple Environments (5 min), Multi-Environment Test, Step 4: Add a Feedback Mechanism (3 min), Feedback Mechanism, Step 5: Prioritize Issues Found (2 min), Issues Prioritized, Step 6: Practice the Rollback Process (5 min), Rollback Practice, You're Done — plus a hands-on lab, quiz, and project artifact.
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