TikTok returns `open_id`, `union_id`, `display_name`, and `avatar_large_url` only under `user.info.basic`, while `username` belongs to `user.info.profile`. Sign-in requested the profile scope alone and read fields from both, which held together only because the identity subject was not load-bearing. It is now. Updating a session or a user profile reissued the session cookie through the new-sign-in path, which clears the provider account binding. Same-user refreshes keep their binding, as the password-change path already does.
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 send an e-mail to security@better-auth.com.
All reports will be promptly addressed, and you'll be credited accordingly.
