typescript const { data, error } = await supabase.auth.signInWithPassword({ email, password, }); Stores JWT in localStorage automatically.

Step 4 — OAuth Login

typescript const { data, error } = await supabase.auth.signInWithOAuth({ provider: "google", options: { redirectTo: "https://yoursite.com/auth/callback", }, });

Step 5 — Password Reset

typescript const { error } = await supabase.auth.resetPasswordForEmail(email, { redirectTo: "https://yoursite.com/reset", }); User receives email with magic link.

Step 6 — Row-Level Security

For each table, enable RLS: sql ALTER TABLE posts ENABLE ROW LEVEL SECURITY; CREATE POLICY "Users see own posts" ON posts FOR SELECT USING (auth.uid() = userid); CREATE POLICY "Users insert own posts" ON posts FOR INSERT WITH CHECK (auth.uid() = userid); Without RLS, anyone with anon key reads all rows. CRITICAL for production.

Step 7 — Magic Link

typescript const { error } = await supabase.auth.signInWithOtp({ email }); Passwordless login — user clicks email link, instantly logged in.

Step 8 — Session Persistence

By default Supabase persists session in localStorage. For SSR / cookie-based: typescript createBrowserClient(URL, KEY, { cookies: { ... }, });

RLS disabled: massive data leak - Service role key in client: full DB access exposed - No email confirmation: spam signup - No rate limit: brute-force login attacks

Read [Supabase vs Firebase](https://vibecodingturkey.com/en/rehberler/supabase-vs-firebase-en) if still deciding.

How to Manage Supabase Users 2026 — Guide

How to Manage Supabase Users 2026

Supabase Auth is one of the most powerful free user management systems. This guide covers production-ready setup. Step 1 — Enable Auth Providers Supabase Dashboard → Authentication → Providers. Enable: - Email/Password - Google need OAuth Client ID + Secret - Apple Sign in with Apple cert - GitHub OAuth App Step 2 — Email Signup Flow typescript const { data, error } = await supabase.auth.signUp{…

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