Lovable Supabase Auth Not Working
Quick Answer
How do I fix Lovable Supabase Auth Not Working?
Lovable can generate the auth UI correctly while the actual Supabase auth settings, redirect URLs, or session handling remain mismatched. Start with "Check Supabase auth provider settings" before making broader code changes.
Fix signals
- What this answers
- Why lovable supabase auth not working happens and what to change first.
- Fastest move
- Check Supabase auth provider settings
- Use this page if
- Users cannot sign in even though the form looks correct
If this keeps happening
Open the next decision, not just the patch
Use these when the current fix is helpful, but the real answer is a better tool choice, a cleaner workflow layer, or a more trustworthy launch path.
Lovable reviews
Open this when the same full-stack MVP failures keep repeating and you need a harder answer on whether Lovable is still the right bet.
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Cursor review
Open this when the pattern behind the bug is really about generated speed versus owning more of the stack in code.
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Deploy hub
Open this when the fix is exposing a bigger production handoff problem, not just one broken feature.
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Tool picker
Open this when the repeated bug is making you question the whole stack choice instead of the latest patch.
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Firecrawl review
Open this when the app also needs live web data and the next stack decision is no longer only about the builder itself.
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Quick Fix Summary
| Most likely cause | Lovable can generate the auth UI correctly while the actual Supabase auth settings, redirect URLs, or session handling remain mismatched. |
| Fastest fix | Check Supabase auth provider settings |
| Use this page if | Users cannot sign in even though the form looks correct |
You're in the right place if...
- !Users cannot sign in even though the form looks correct
- !Auth redirects back to login
- !Supabase is connected but sessions are missing
Why this happens
Lovable can generate the auth UI correctly while the actual Supabase auth settings, redirect URLs, or session handling remain mismatched.
Fix
Check Supabase auth provider settings
Open Supabase Authentication and verify your site URL, redirect URLs, and enabled providers match the deployed domain exactly.
Verify production environment variables
Make sure the deployed app has the correct NEXT_PUBLIC_SUPABASE_URL and NEXT_PUBLIC_SUPABASE_ANON_KEY. One wrong value breaks the whole auth flow.
Tell Lovable to add a real loading/session check
Ask Lovable to wait for the auth state before redirecting so the app does not treat a still-loading session as logged out.
Prevent this next time
Auth bugs are usually configuration bugs. Verify redirect URLs and env vars before rewriting components.
Frequently Asked Questions
Mismatched redirect URLs between Supabase and the deployed domain are one of the most common causes.
Yes. The form can render perfectly while the actual session or redirect flow fails behind the scenes.
Related fixes
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Why Does Lovable Keep Changing Things I Didn't Ask For?
Lovable Form Submits but Supabase Saves Nothing