Basic (Auth)

Better Auth runs on a Drizzle adapter with a production ready setup. Email and password sign in, sessions, and role based access control are all included.

Pre-Built Pages

Good news: the core authentication pages are already done and integrated into the router. You don't need to build them from scratch.

• Sign In
• Sign Up
• Forgot Password
• Sign Out

They're fully functional and wired up to the authentication client, so you can focus on building the actual application.

User Auth & Sessions

The Middleware

The main guard for protected routes is the isAuthenticated middleware. It's simple:

• It checks for a valid user and token in the session context.
• If it fails the check, it automatically bounces the user to /sign-in (that's Links.signIn).
• If it passes, it stuffs the user and token into the route context so your server functions can use them.

Session Helpers

All the session stuff is in src/features/auth/session.ts, which sits on top of the main session store (@/lib/session).

Roles & Permissions (RBAC)

You'll mainly use the hasPermission middleware or the verifyPermission server action to check access.

• hasPermission(permission): This is a TanStack Router middleware. It runs before the route/handler executes, checks the user's permissions, and sets an isPermitted: boolean flag in the context.
• withPermission(context, handler): A simple wrapper. It runs a secure handler function only if context.isPermitted is true.

Look at this: Any secure server action, like getRoles, uses this pattern:

.middleware([isAuthenticated, hasPermission({user: ["read"]})])

.handler(async ({ context }) => withPermission(context, () => { /* safe action code goes here */ }))