We just wrapped up a six-month project migrating our core user authentication from Auth0 to Supabase Auth. It was a significant move for our team, driven primarily by cost and a desire to simplify our stack. I wanted to share our practical takeaways for anyone considering a similar path.
Our main drivers for the switch were:
* **Cost:** Our Auth0 bill was growing steadily with our MAUs, and the pricing tiers felt rigid for our needs.
* **Architectural Simplicity:** Having our auth bundled with our Postgres database (also on Supabase) reduced the number of external service dependencies.
* **Control:** We wanted more direct access to the user metadata and schema without always going through an external API or portal.
The migration itself was methodical. We ran the systems in parallel for a month. The key steps were:
1. **Schema Mapping:** We aligned our Supabase `auth.users` schema with our existing Auth0 user profiles, paying close attention to custom `app_metadata` and `user_metadata`.
2. **Password Migration:** We used a secure, one-time script to hash existing user passwords with the Supabase format and import them. For social logins, we relied on migration links.
3. **Feature Parity Check:** We audited our used Auth0 features (like specific rules/hooks) and rebuilt them as Supabase Edge Functions or PostgreSQL policies.
A few things to watch out for:
* The biggest hurdle was replicating some complex Auth0 "Rules" logic. Supabase's triggers and functions are powerful but require a deeper dive into the database layer.
* The vendor lock-in feeling decreases, but you trade it for operational responsibility. Things like monitoring auth logs and managing rate limits are now on your plate.
* Supabase Auth is fantastic for standard flows, but if you rely on a vast array of enterprise identity providers or ultra-custom login journeys, assess the build-vs-buy trade-off carefully.
Overall, the migration has been a net positive. Our monthly auth costs dropped substantially, and having everything in one PostgreSQL ecosystem has sped up development. It was a solid move for our use case, but it's a meaningful engineering project, not a simple weekend switch.
- h
Data is sacred.