How to Fix Supabase New Row Violates Row Level Security Policy Errors Without Disabling RLS and Calling It a Solution

Why this error deserves respect: row level security is doing exactly what you asked it to do. The frustrating part is that what you asked may not match what your app is actually sending.

Typical error:

new row violates row-level security policy

The worst response is disabling RLS just to make the insert work. That turns a policy bug into a security bug.

Step 1: identify which role is making the request

In Supabase-backed apps, this matters a lot:

1. authenticated user
2. anonymous user
3. service role

If you think you are inserting as an authenticated user but the request is actually anonymous, the policy mismatch is already explained.

Step 2: inspect the insert policy itself

A common pattern is that the policy expects ownership like:

auth.uid() = user_id

If your insert payload omits user_id or sends the wrong value, the policy blocks it correctly.

Step 3: test the shape of the row

Look at the exact insert payload your app sends. For example, if the table expects the currently signed-in user to own the row:

const { data, error } = await supabase
  .from("todos")
  .insert([{ user_id: user.id, title: "Buy coffee" }]);

If user_id is absent or wrong, the policy cannot pass.

Step 4: separate frontend auth from backend admin work

If this insert is truly an admin action, use the service role only in trusted server-side code. Do not solve every policy mismatch by moving sensitive writes into the browser with broader privileges.

Step 5: inspect policies directly

In SQL:

select * from pg_policies where tablename = 'todos';

This gives you the real policy definitions rather than the memory of what you think they say.

Bottom line

Supabase RLS insert errors usually mean one of three things: wrong auth context, wrong row shape, or wrong policy logic. Fix the mismatch instead of turning security off to get one green checkmark.

Sources

• Supabase Row Level Security docs
• PostgreSQL row security docs