A server-side port of Better Auth. Same routes, same JSON shapes, same error codes, same database — so a Python service and a TypeScript one are interchangeable on one schema.
Sign-up, sign-in, sessions, sign-out, password reset, email verification and social login, mounted under /api/auth.
from better_auth import BetterAuth, EmailAndPassword
from better_auth.integrations.fastapi import BetterAuthFastAPI
from fastapi import Depends, FastAPI
auth = BetterAuth(
secret="...", # openssl rand -base64 32
base_url="http://localhost:8000",
email_and_password=EmailAndPassword(enabled=True),
)
app = FastAPI()
ba = BetterAuthFastAPI(auth)
app.include_router(ba.router) # mounts /api/auth/*
@app.get("/me")
async def me(result: dict = Depends(ba.require_session)):
return result["user"]uv add better-auth-server[fastapi,sqlalchemy]The core is framework-agnostic, and FastAPI, Litestar, Flask and Django integrations ship in the box — each a thin layer over plain request/response dataclasses. There is a client too: better-auth-client talks to any Better Auth server from Python, sync or async. Start here.