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Home / Migrations / Firebase Auth → Supabase Auth

Firebase Auth → Supabase Auth

medium

Move just the auth layer from Firebase to Supabase without touching Firestore. Useful when migrating step-by-step.

Estimated: 4-8h · 6 steps

Progress0%

Step 1: Create Supabase project

Enable email/password and OAuth providers matching your Firebase auth methods.

Step 2: Export Firebase users

Use Firebase Admin SDK to export user list with emails and provider info.

npx firebase-admin-node export-users > users.json

Step 3: Import to Supabase

Use Supabase Management API to create users. Passwords can't be migrated — send reset emails.

curl -X POST 'https://api.supabase.com/v1/projects/{id}/auth/users' -H 'Authorization: Bearer $SUPABASE_ACCESS_TOKEN'

Step 4: Update client SDK

npm uninstall firebase && npm install @supabase/supabase-js

Step 5: Replace auth calls

signInWithEmailAndPassword → supabase.auth.signInWithPassword(). onAuthStateChanged → supabase.auth.onAuthStateChange().

Step 6: Handle JWT verification

Supabase JWT format differs. Update any server-side JWT verification to use Supabase's JWKS endpoint.

✓ Sign in/up/out work. Sessions persist. OAuth providers functional.

Get started with Supabase Auth →