Database / Supabase basics Interview Questions
Why is Row Level Security important in a client-facing Supabase app?
In a typical Supabase app, the frontend talks to the database almost directly through the auto-generated API using a public anon key that ships inside the client bundle. Without RLS, that key alone would be enough for anyone to read or modify every row in every table.
RLS closes that gap by moving authorization into the database itself: a policy checks conditions like auth.uid() = user_id on every row before returning or writing it, regardless of which client or tool issued the request. This is different from a traditional backend, where a private server sits between the client and the database and enforces access control in application code; Supabase's model instead assumes the API is public-facing and pushes the trust boundary down to Postgres.
Skipping RLS on a table that should be restricted is one of the most common Supabase security mistakes, since the table remains fully open to any authenticated (or even anonymous) client by default once RLS is off.
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