Gustavo Valverde
d5e7128bf1
Two generic extension points complete the contribution surface. A custom grant handler injects per-request claims and response fields through the new `extra` option on the exported `createUserTokens`: `extra.accessTokenClaims` merge into the JWT access token beneath the host-pinned claims, and `extra.tokenResponse` into the response body beneath the standard OAuth fields. `CreateUserTokensParams` is now exported so external grant handlers can type it. Plugins register token-endpoint client-authentication methods through `OAuthContributions.clientAuthStrategies`, keyed by `client_assertion_type` and dispatched at the shared `extractClientCredentials` chokepoint (so the token, introspection, and revocation endpoints all honor them). A method such as wallet attestation becomes executable, not merely advertised.
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.