The approval guard filtered userId on null, which serial ids turn into 0, so every approval returned 409. Pending clients come only from anonymous registration and never have a userId, so the guard now checks referenceId alone. Pending clients also store referenceId as null, because Prisma on MongoDB does not match unset fields with a null filter. A pending private_key_jwt client can rotate its inline keys again: the pending check in client assertion verification only guarded key rotation, and token endpoints already refuse pending clients.
Better Auth
Better Auth is a framework-agnostic authentication (and authorization) framework for TypeScript. It provides a comprehensive set of features out of the box and includes a plugin ecosystem that simplifies adding advanced functionalities with minimal code in a short amount of time. Whether you need 2FA, multi-tenant support, or other complex features, it lets you focus on building your actual application instead of reinventing the wheel.
Why Better Auth
Authentication in the TypeScript ecosystem is a half-solved problem. Other open-source libraries often require a lot of additional code for anything beyond basic authentication. Rather than just pushing third-party services as the solution, I believe we can do better as a community—hence, Better Auth.
Contribution
Better Auth is a free and open source project licensed under the MIT License. You are free to do whatever you want with it.
You could help continuing its development by:
Security
If you discover a security vulnerability within Better Auth, please report it via GitHub Security Advisories.
All reports will be promptly addressed, and you'll be credited accordingly.
