Node.js Self-Hosted Auth Enters New Era as Embedded Libraries Outpace Legacy Solutions

The self-hosted authentication landscape for Node.js teams is experiencing significant consolidation and innovation. With legacy solutions like Lucia deprecated and Auth.js folding into Better Auth, new entrants like nauth-toolkit are demonstrating that embedded auth libraries can still deliver meaningful advances in security hardening and developer experience. Understanding the architectural tradeoffs between embedded libraries, hybrid SDK/sidecar approaches, and dedicated identity providers is now critical for teams evaluating the right authentication strategy.