Identity migration affects every active user and needs a complete rehearsal. WZ-IT provides a Supabase migration from €3,490 after reviewing the Auth0 tenant, applications and sign-in methods.
An Auth0-to-Supabase Auth migration transfers more than user profiles. Passwords, social identities, MFA, SSO, roles, claims, sessions and application integration all interact. A failed cutover can lock users out or change access rights.
The migration strategy therefore follows the sign-in methods actually in use.
Inventory Auth0
Capture before implementation:
- database connections and password login
- social and enterprise identity providers
- passwordless email or phone login
- MFA factors and recovery processes
- SAML or OIDC connections
- Auth0 Organizations, roles and permissions
- Rules, Actions, Hooks and custom claims
- Universal Login and custom login interfaces
- applications, APIs, audiences and callback URLs
- user count, active accounts and login frequency
- downtime and rollback requirements
Not every Auth0 capability has an identical Supabase equivalent. Build a feature matrix with direct mappings, required adaptation and replacement work.
Map users and authorisation
| Auth0 | Supabase target |
|---|---|
| User profile | auth.users and an optional application profile table |
user_metadata |
raw_user_meta_data for non-sensitive user data |
app_metadata |
raw_app_meta_data or private tables |
| Roles and permissions | Claims, profile tables and RLS policies |
| Social identity | Supabase OAuth providers and auth.identities |
| Actions and Rules | Hooks, Functions or application logic |
| Organizations | Custom tenant model with memberships and RLS |
Large or sensitive authorisation data should not be placed indiscriminately in JWT metadata. A relational model in a private schema is often easier to audit.
Export from Auth0
The official Supabase guide lists two user-data paths:
- Auth0 Data Export
- Auth0 Management API, with rate limits and potentially multiple batches
Supabase directs customers to Auth0 support for password hashes and MFA factors. Resolve this early because it determines whether passwords can remain or whether the project needs reset and fallback flows.
Current Supabase Auth documentation supports bcrypt and Argon2 password hashes. Verify the algorithm, parameters and Auth0 ID mapping before import.
One-off or rolling migration
One-off cutover
Prepare and import all transferable accounts at a defined time, then switch the application completely to Supabase Auth.
Advantages:
- only one identity system after cutover
- clear technical separation
Drawbacks:
- concentrated risk in a short window
- users need to authenticate again
- non-importable accounts need a reset or support path
Rolling migration
New users already use Supabase. Existing users move after their next successful Auth0 sign-in or through a pre-import. The official guide describes a fallback: try Supabase, then Auth0, and create the Supabase account after successful legacy authentication.
Advantages:
- transition is distributed across active users
- no single hard switch for all accounts
Drawbacks:
- two secure auth paths run temporarily
- inactive users eventually need a backfill or reset
- authorisation must remain consistent in both paths
Treat password, passwordless and OAuth separately
Password accounts: import hashes when export and algorithm permit; otherwise design reset or rolling fallback.
Passwordless: carry over verified email or phone state and configure templates, SMTP and OTP flows in Supabase.
Social OAuth: configure providers and callbacks in Supabase. Users authenticate again at the provider; map provider IDs to the existing application profile afterwards.
Each group needs distinct test cases rather than one undifferentiated user export.
MFA, SSO and organisations
MFA factors, SAML connections and Auth0 Organizations are common scope drivers. Review:
- supported MFA methods and required re-enrolment
- enterprise SSO per customer domain
- SAML metadata, certificates and callback URLs
- tenants, memberships and invitations
- organisation-specific and global roles
- mapping to RLS and server-side authorisation
A B2B product with tenants normally needs its own organisation model above the Auth user table.
Adapt application, JWT and RLS
The application receives new:
- SDK calls and session handling
- access and refresh tokens
- JWT claims and expiry rules
- callback, logout and redirect URLs
- email templates and SMTP settings
- server-side keys and API validation
Existing Auth0 tokens do not become Supabase sessions. APIs may need to validate both issuers during a rolling transition. Remove the legacy path afterwards.
Accept roles and tenant access with positive and negative RLS tests. The Supabase RLS audit guide provides the testing framework.
Acceptance and rollback
Test at least:
- password, passwordless and every OAuth provider
- new and migrated users
- email verification and password reset
- MFA and SSO where in scope
- roles, claims and tenant isolation
- token refresh, logout and session expiry
- disabled, blocked and duplicate accounts
- support path for users who cannot migrate
Retire Auth0 only after active sign-in routes are stable and the rollback period has ended. Use the Supabase migration checklist for the broader process.
WZ-IT can support Supabase Auth within the ongoing managed Supabase service.
