Migrate Auth0 to Supabase Auth: users, passwords and sign-in

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

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.

Sources

• Supabase: migrate from Auth0 to Supabase Auth
• Auth0: export user data
• Supabase Auth: users