How I approached multi-tenancy in Next.js with PostgreSQL RLS

wendel andrady — Sun, 06 Sep 2026 15:19:35 +0000

Multi-tenancy looks simple at first.

You add an organization_id to your tables, check it in your queries, and move on.

The problem is that this puts a lot of responsibility on application code.

I wanted tenant isolation to be enforced at the database level too, so I used PostgreSQL Row Level Security (RLS).

The basic architecture is:

This also makes other parts of the application more interesting:

The biggest lesson for me was that multi-tenancy isn't really a single feature.

It's an authorization model that needs to stay consistent across the application and database.

I built these patterns into a reusable B2B SaaS foundation because I got tired of rebuilding them for every project.

If you're building a multi-tenant SaaS with Next.js and Supabase, I've put the full foundation here:

I'd be interested to hear how other Next.js developers approach tenant isolation. Do you rely mainly on application-level checks, RLS, or both?

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