BA

Better Auth•4mo ago

Marvingg

Consistent Signup Event Tracking Across Auth Methods

I’m trying to track signup events across all auth methods (email/password, magic link, OAuth) using Better Auth hooks. Email signups work fine, but I can’t access user data after OAuth callbacks.

Current Implementation
export const auth = betterAuth({
hooks: {
after: createAuthMiddleware(async (ctx) => {
const isSignup =
ctx.path === "/signup" ctx.path.startsWith("/callback/");

if (isSignup && ctx.body?.status === 200) {
const { user } = ctx.body {};
if (user) await trackSignupEvent(user);
}
}),
},
});


What Works

• Email/Password
• Path: /signup
• ctx.body.user is available → tracking works

What Fails

• OAuth (e.g., /callback/google)

Questions

1. How can I reliably access user data during OAuth callbacks? Different hook? Different context properties?
2. Are there separate hooks for different auth flows?
3. What’s the recommended server-side pattern for consistent signup tracking across methods?
4. For OAuth: what properties are exposed in the context, and how do I get the user record?

Current Workaround

Handling OAuth tracking client-side in the onboarding component, but this is unreliable and misses edge cases...

Environment

Better Auth (latest)

Next.js App Router

PostgreSQL + Prisma

Auth methods: email/password, magic link, Google OAuth