Common Bugs in Lovable-Generated Code

Lovable generates components that fetch data on mount but don't re-fetch after mutations. It uses Supabase's client-side auth which has inherent timing issues on initial page load. Realtime subscriptions are set up in useEffect without proper cleanup functions

Lovable apps frequently have state synchronization issues — data shows correctly after creation but doesn't update after edits without a page refresh. Component re-mounting on navigation causes loss of form state. Auth redirects sometimes loop because the auth state check races with the Supabase session initialization. Realtime subscriptions connect but don't clean up on unmount, causing memory leaks and duplicate event handlers

Start by running your app through its complete user flow — sign up, use every feature, try edge cases like empty inputs and invalid data. Most Lovable bugs surface when you go off the happy path. Use your browser's developer tools to watch for console errors, failed network requests, and unhandled promise rejections. TypeScript's strict mode will catch many issues at compile time if it's not already enabled.

For async errors, wrap every server-side operation in try/catch blocks and return meaningful error messages. For state bugs, consider whether the state belongs in the URL, in a server component, or in client state — Lovable often defaults to client state when server state would be more appropriate. For data fetching issues, implement proper loading and error states for every data-dependent component.

The best way to prevent Lovable bugs from reaching production: enable TypeScript strict mode, add ESLint rules for common mistakes (no-floating-promises, exhaustive-deps), and write tests for critical user flows. Even basic smoke tests catch the majority of issues.