How to Track Errors in My Lovable App
Add Sentry (free, 5,000 errors/month) to your Lovable app using the @sentry/react SDK. Since Lovable generates React apps, Sentry integrates seamlessly. It captures JavaScript errors, failed Supabase queries, and Edge Function crashes — with full stack traces and the exact line of code that failed. Ask Lovable to add the Sentry initialization to your app entry point.
Why this matters
Lovable apps are React + Supabase applications, which means errors can happen in three places: the React frontend, the Supabase database queries, and the Edge Functions. Without error tracking, you only see errors when you happen to have your browser console open. Your users see errors you never know about.
What's at stake
Silent errors in a Lovable app erode trust. A user who clicks a button and nothing happens — or sees a blank screen — assumes the app is broken and leaves. Error tracking turns these invisible failures into actionable alerts so you can fix them before they cost you users.
Step by step.
Create a Sentry account and project
Sign up at sentry.io and create a React project. The free tier includes 5,000 errors/month — more than enough for an early-stage Lovable app. Copy your project DSN from the settings page.
Ask Lovable to add Sentry
Tell Lovable: "Add Sentry error tracking to my app. Use this DSN: [your DSN]. Initialize it in the app entry point with browser tracing and replay integrations." Lovable will install @sentry/react and add the initialization code.
import * as Sentry from "@sentry/react";
Sentry.init({
dsn: "YOUR_SENTRY_DSN",
integrations: [
Sentry.browserTracingIntegration(),
Sentry.replayIntegration(),
],
tracesSampleRate: 1.0,
replaysOnErrorSampleRate: 1.0,
});Store your Sentry DSN in Lovable Secrets
Do not hardcode the Sentry DSN in your frontend code. Store it in Lovable Secrets and reference it as an environment variable. While a DSN is not as sensitive as an API key, keeping it in Secrets follows best practices and prevents it from being visible in your source code.
Configure Sentry alerts
In your Sentry dashboard, create an alert rule that emails you on the first occurrence of any new error. Focus on errors in critical flows: authentication, data loading, payment processing, and form submissions. Ignore noisy browser extension errors by adding filters.
Test with a deliberate error
Ask Lovable to add a temporary test button that throws an error. Click it in the published app (not the editor preview), then check your Sentry dashboard. You should see the error with a full stack trace. Remove the test button after confirming Sentry works.
Catch errors in your Lovable app before users notice them
- Automated error detection for React + Supabase apps
- Real-time alerts when your Lovable app encounters a problem
- Error history showing whether issues are getting better or worse
Frequently asked questions.
Lovable shows build errors and some runtime errors in the editor preview, but it does not track errors in your published app. Sentry fills this gap by monitoring your live, published version where real users interact with your app.
Sentry captures frontend errors, including failed Supabase queries that throw exceptions. For Supabase-specific monitoring (RLS policy failures, connection issues), also check the Supabase dashboard. Sentry and Supabase monitoring are complementary.
The most common are: missing or incorrect RLS policies causing data access failures, expired or misconfigured Supabase keys, Edge Function timeouts, and TypeScript type errors that slip through to runtime. Sentry captures all of these with context about what the user was doing.
Yes. Sentry works with any deployment method — Lovable Cloud, custom domain, or any other hosting. It runs in the browser as part of your React app, so it works wherever your app is served.