Cursor·FixauthSupabasebeginner

Cursor Supabase Auth Session Missing After Refresh

Quick Answer

How do I fix Cursor Supabase Auth Session Missing After Refresh?

The Cursor auth flow is not restoring the Supabase session correctly on app load, or the redirect URLs and auth environment variables do not match the deployed domain. Start with "Verify the Supabase URL, anon key, and redirect URLs" before making broader code changes.

Fix signals

What this answers: Why cursor supabase auth session missing after refresh happens and what to change first.
Fastest move: Verify the Supabase URL, anon key, and redirect URLs
Use this page if: User signs in successfully, then gets logged out on refresh

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.

Cursor review

Open this when the issue is making you decide whether a more code-first workflow is still the right long-term move.

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Lovable reviews

Open this when the bug is making you reconsider whether a faster generated path would reduce the operational overhead.

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Deploy hub

Open this when the fix is exposing a broader production handoff problem, not just one bug in the code.

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Tool picker

Open this when repeated failures are pushing the decision back up to the stack level.

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Firecrawl review

Open this when the app also needs live web data and the bigger stack question is no longer just about the coding tool.

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Quick Fix Summary

Most likely cause	The Cursor auth flow is not restoring the Supabase session correctly on app load, or the redirect URLs and auth environment variables do not match the deployed domain.
Fastest fix	Verify the Supabase URL, anon key, and redirect URLs
Use this page if	User signs in successfully, then gets logged out on refresh

You're in the right place if...

!User signs in successfully, then gets logged out on refresh
!Protected pages bounce back to login
!Auth works in preview but fails on the deployed site

Why this happens

The Cursor auth flow is not restoring the Supabase session correctly on app load, or the redirect URLs and auth environment variables do not match the deployed domain.

Fix

Verify the Supabase URL, anon key, and redirect URLs

Check the deployed environment variables and make sure Supabase Authentication -> URL Configuration includes the exact production domain and callback paths.

Make the app restore auth state on boot

Use this prompt to make Cursor restore the session before rendering protected routes.

Copy this prompt

The Supabase session is missing after refresh.
Please update the auth flow so the app restores the existing session on load, waits for auth initialization before rendering protected pages, and redirects only after the auth state is known.

Test the full login flow on the live domain

Sign in on the deployed URL, refresh a protected page, and confirm the session still exists. If it fails only in production, the redirect URLs or env vars are still wrong.

Prevent this next time

Treat auth as a production flow, not just a preview flow. Always test sign-in, refresh, and sign-out on the deployed domain before launch.