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RLS Errorservice_role KeyPublishable KeyAnon KeyMCP Setup

Supabase publishable key: when frontend exposure is safe

Publishable keys can be used by browsers only when exposed tables have correct RLS. This Fix Kit helps you pair frontend key usage with ownership policies and isolation tests.

Check frontend key placement

Pair public frontend keys with RLS and proof-of-fix tests.

Issue

Pick a shortcut, then tune the settings below.

Fix settings

These controls restore the original page behavior.

Placeholders

Use schema names only. Do not paste secrets.

No secrets needed. Placeholder-only.

Publishable key + RLS guidance

Start with key placement guidance. The RLS SQL template remains available as a secondary output.

Copy in one click

Do not use USING (true) for private tables.

publishable / anon key placement:

Frontend exposure is expected only when RLS and policies are correct; it is not automatically safe.
Public keys do not protect data by themselves.
Verify RLS on every table that is reachable from browser or mobile clients.

Safe placement pattern:
- Browser/mobile: publishable or anon key only.
- Server-only code: service_role or secret key only when a privileged operation is required.
- Public repo: never commit real keys; keep env examples as placeholders.
- Frontend env: use public keys only, and never use service_role or secret keys.

Copy outputs

Copy the companion outputs for agent repair, testing, and key placement.

{}

Copy AI repair prompt

Paste this into Cursor, Claude Code, or Lovable for an agent fix tailored to your schema.

Copy proof-of-fix test

Get a checklist and SQL test script to confirm the fix works as intended.

{}

Copy secondary RLS SQL

For intentionally public tables only. Do not use USING (true) for private tables.

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