"Supabase Auth Flutter Email Password: Signup & Login Guide"
Set up supabase auth flutter email password — signup, login, session persistence, sign-out and password reset with runnable Flutter 3.x code.
Setting up supabase auth flutter email password login is the first real feature most Flutter + Supabase apps need — and it's the one where small mistakes snowball. Users get locked out by email confirmation they never knew existed, sessions vanish after an app restart, and "Invalid login credentials" haunts the login screen with zero useful detail. This guide wires the complete flow — sign-up, sign-in, session handling, sign-out, and password reset — with runnable Flutter 3.x code on supabase_flutter 2.18.x, including the failure modes most tutorials skip. Last updated: October 3, 2026 What you'll learn Initializing Supabase with the publishable key ( sb_publishable_… ) Sign-up with email and password, including the email-confirmation fork Sign-in with password and clean AuthException handling How to check if a user is logged in and route on auth state Session persistence: keeping users logged in across app restarts Sign-out and password-reset flows Supabase Auth Flutter Email Password: How It Fits Together Three pieces work together: the Supabase Auth service (configured in your dashboard), the supabase_flutter client in your app, and your UI. The calls you'll use are signUp , signInWithPassword , signOut , and resetPasswordForEmail ; the client stores the session locally and exposes onAuthStateChange so your UI can react to sign-ins, sign-outs, and token refreshes. Everything below assumes you've created a project at supabase.com — the free tier is plenty. Step 1 — Create the project and initialize the client Add the dependency: # pubspec.yaml dependencies: flutter: sdk: flutter supabase_flutter: ^2.18.0 Initialize once in main.dart before runApp : // lib/main.dart import 'package:flutter/material.dart'; import…