Supabase Weak Password Error

Supabase error weak_password (weak_password) explained: what it means, why it happens, and how to fix it — with copy-paste code examples.

Error code weak_password Supabase Last verified 2026-08-19

Quick Answer

Validate password length client-side before calling signUp or updateUser. If that does not apply, show the minimum length requirement (8 characters) in the UI — the full checklist is below.

Error Code

Error code: weak_password
Official name: weak_password
Service: Supabase

What does this error mean?

Password should be at least 8 characters.

Common Causes

How to Fix

  1. Validate password length client-side before calling signUp or updateUser
  2. Show the minimum length requirement (8 characters) in the UI
  3. Check Authentication settings for the configured minimum password length
  4. Use a strong password - server-side strength checks may reject predictable ones

Code Examples

Client-side password validation javascript 
function validatePassword(pwd) {
  return pwd.length >= 8
}

if (!validatePassword(password)) {
  showInlineError('Password must be at least 8 characters')
}

Mirror the server rule (8 chars minimum) so users fix the password before the API rejects it.

Framework-Specific Fixes

supabase-js

Pre-validate on the client to avoid a wasted round trip.

if (password.length < 8) {
  setError('Password must be at least 8 characters')
  return
}
const { error } = await supabase.auth.signUp({ email, password })

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Frequently Asked Questions

Why am I seeing Supabase error weak_password?

Most often this happens when password shorter than the minimum (default 8 characters), or when password update via updateUser({ password }) fails validation.

How do I fix Supabase error weak_password?

Validate password length client-side before calling signUp or updateUser.

Which frameworks have documented fixes for error weak_password?

This page documents fixes for: supabase-js.

Official Sources

This page is based on the official Supabase documentation linked below and adds practical troubleshooting guidance on top.