How to Build Multi-Tenant SaaS Using Next.js, Prisma and PostgreSQL

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A practical architecture guide outlines three multi-tenancy strategies for SaaS applications built with Next.js, Prisma, and PostgreSQL. The recommended default approach uses a shared database schema with a tenant ID column on every table, suitable for 100 to 10,000 tenants. For stronger data isolation, developers can implement PostgreSQL Row-Level Security policies that enforce tenant filtering at the database level, acting as a safeguard when application code misses a filter. The guide also warns that PgBouncer in transaction mode can strip session variables before queries execute, and recommends using session mode or setting tenant context within the same transaction. Developers are advised to start with the shared schema model and migrate specific tenants to stricter isolation only as business needs grow.

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