Fix: Lovable Can't Connect to Supabase
Quick Answer
How do I fix "Supabase connection failed" in Lovable?
Check that your Supabase project URL and anon key are correct in Lovable's settings. Then verify that Row Level Security (RLS) policies allow the operations you need.
Fix signals
- What this answers
- How to fix supabase connection failed in Lovable.
- Fastest move
- Verify Supabase credentials
- Use this page if
- Error: 'Failed to connect to Supabase'
If this keeps happening
Open the next decision if the same bug class keeps coming back
Use these when the troubleshooting page named the failure, but the higher-leverage move is changing the stack choice, support layer, or production workflow.
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
| Issue | Supabase connection failed |
| Fastest fix | Verify Supabase credentials |
| Use this page if | Error: 'Failed to connect to Supabase' |
Symptoms
- !Error: 'Failed to connect to Supabase'
- !Tables exist but data doesn't load
- !Authentication works but database queries fail
- !Row Level Security (RLS) blocking all requests
Step-by-Step Fix
Verify Supabase credentials
In Lovable, go to Settings > Integrations > Supabase. Confirm the project URL and anon key match your Supabase dashboard (Settings > API).
Check RLS policies
In Supabase Dashboard > Authentication > Policies, ensure you have policies that allow SELECT, INSERT, UPDATE for authenticated users. A common mistake is enabling RLS without adding any policies.
Test the connection directly
Open your Supabase dashboard > SQL Editor and run: SELECT * FROM your_table LIMIT 1. If this fails, the issue is in your schema, not Lovable.
Regenerate API keys
If credentials are compromised or expired, regenerate them in Supabase Dashboard > Settings > API > Regenerate keys. Update them in Lovable.
Check Supabase project status
Free Supabase projects pause after 1 week of inactivity. Check your project status in the Supabase dashboard and restore if paused.
Frequently Asked Questions
RLS blocks all access by default. You must create policies that explicitly allow operations. A policy like 'allow all for authenticated' is the simplest starting point.
Lovable generates apps that use Supabase by default. You can modify the code to use a different database, but it requires manual changes.