Better Auth implementation with Next.js with my current backend setup
Hi everyone,
I already have a custom backend with working auth APIs:
POST /api/auth/login → expects { email, password } (or sometimes { phone, password }) and returns an access_token.
POST /api/auth/signup → creates a new user and returns an access_token.
When I hit these endpoints directly with fetch or axios, everything works fine.
But when I try to integrate Better Auth on the frontend with createAuthClient, it always tries to call /api/auth/sign-in/email or /api/auth/sign-up/email. That gives me a 404 because my backend doesn’t have those routes.
I tried overriding paths like this:
endpoints: {
signIn: {
email: { path: "/login" },
},
signUp: {
email: { path: "/signup" },
},
}
But Better Auth still ends up calling /sign-in/email instead of my /login.
So my questions are:
Can Better Auth’s frontend client work with a custom backend that already has its own /login and /signup endpoints?
Or is Better Auth meant to be used only if I also set up the Better Auth backend (with its expected routes)?
If I can integrate with my own backend, what’s the correct way to configure createAuthClient so it maps my /login and /signup endpoints?
Thanks in advance — I’m stuck between using my backend as-is vs replacing it with Better Auth’s backend setup. Any guidance would be really appreciated!
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