Supabase auth hardening checklist that keeps production sign-in safe
Production sign-in breaks in predictable places: an open redirect, an email link that lands on the wrong URL, a table that exposes rows to the wrong user, or a privileged key that shipped inside a client bundle. Hardening auth means closing those paths before launch, then proving each one with a test.
Auth documentation describes authentication as verifying identity and authorization as verifying resource access, with JSON Web Tokens for the first and row-level rules for the second. Use that split as the hardening plan. Identity checks belong in the auth configuration. Data access belongs in the database, enforced on every request.
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