How to Build a Multi-Tenant SaaS API with Node.js, RBAC, and Audit Logging
SMRTR summary
Building multi-tenant SaaS APIs without proper isolation is a silent data leak waiting to happen — missing tenant filters return wrong data with no errors logged. This tutorial walks through a production-ready Node.js/PostgreSQL setup covering row-level tenant isolation via JWT, RBAC middleware, tamper-proof audit logging, and per-tenant Redis rate limiting, all enforced before route handlers fire.
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