configuring-better-auth

OAuth 2.1 and OIDC authentication centralizes user identity across multiple apps using Better Auth. Configure a centralized auth server with OIDC provider plugin, register OAuth clients with PKCE support, and implement token management in httpOnly cookies. This approach enables SSO while securing token exchange between client and server.

PKCE (Proof Key for Code Exchange) is a security extension for OAuth 2.1 that protects public clients, such as mobile apps and single-page applications, from authorization code interception attacks. It requires clients to generate a code verifier and challenge during authentication, preventing malicious actors from exchanging stolen authorization codes.

JWKS (JSON Web Key Set) verification validates OAuth tokens by retrieving and checking the provider's public keys against token signatures. Better Auth guides configuring JWKS endpoints and token lifecycle management to ensure only legitimate tokens from your OIDC provider are accepted by your applications.

Yes. Better Auth supports admin-controlled OAuth client registration endpoints, allowing you to programmatically register SSO clients, manage credentials, and enforce PKCE requirements. This enables dynamic client management across your multi-app platform while maintaining security controls.

Store OAuth tokens in httpOnly cookies to prevent cross-site scripting (XSS) attacks from accessing them. Better Auth provides guidance on token storage, refresh mechanisms, and lifecycle management to protect sensitive credentials while maintaining user session continuity across applications.

Yes. Better Auth integrates with OIDC providers through its OIDC plugin, supporting standard OAuth 2.1 flows and provider plugins. This allows you to connect your centralized authentication system to existing identity providers while implementing PKCE, JWKS, and token management for enhanced security.