Supabase Auth errorSupabase Auth: weak_password (password strength criteria not met)

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Why the password is rejected, and the fix

1. 01

   The password breaks a project rule

   “User is signing up or changing their password without meeting the password strength criteria.” Supabase docs, Auth error codes (weak_password)

   The project’s Auth settings set the minimum length and which characters are required. A password that misses one is rejected with weak_password.

2. 02

   The app shows a generic error

   “Use the AuthWeakPasswordError class to access more information about what they need to do to make the password pass.” Supabase docs, Auth error codes (weak_password)

   Match on error.code, not the message text, and read the reasons from the error to tell the user what to change.

   import { isAuthWeakPasswordError } from '@supabase/supabase-js';
   
   const { error } = await supabase.auth.signUp({ email, password });
   if (isAuthWeakPasswordError(error)) {
     // error.reasons lists what failed: 'length', 'characters' or 'pwned' (found in a leaked list)
     showPasswordHelp(error.reasons);
   }

3. 03

   The form and Auth settings disagree

   “Set a large minimum password length. Anything less than 8 characters is not recommended.” Supabase docs, Password security

   A form that allows 6 characters while Auth requires 8 lets users submit passwords that fail. Supabase recommends at least 8. Show the same rules in the form, and update both when you change one.

4. 04

   The password is in a leaked list

   With leaked password protection on in Auth settings, a common or breached password fails even when it is long, with the reason pwned. Ask for a different password, and suggest a password manager.

Checked against the vendor’s docs on November 9, 2026: Supabase docs: Auth error codes; Supabase docs: Password security.

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