sreekarnv-fastauth 0.4.0

NextAuth-inspired pluggable authentication for FastAPI

FastAuth

NextAuth-inspired pluggable authentication for FastAPI.

FastAuth gives you a complete auth system — credentials, OAuth, email verification, password reset, RBAC, and JWT — without locking you into any particular database or ORM.

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Features

• Multiple providers — email/password, Google OAuth, GitHub OAuth
• Pluggable adapters — SQLAlchemy (SQLite, PostgreSQL, MySQL) or bring your own
• JWT & database sessions — stateless tokens or server-side sessions
• Cookie delivery — HttpOnly, Secure, SameSite out of the box
• Email flows — verification and password reset with customizable transports
• RBAC — roles and fine-grained permissions on any route
• Event hooks — intercept sign-in/sign-up and modify JWT payloads
• RS256 / JWKS — rotate keys and expose a JWKS endpoint for microservices
• CLI — scaffold a project, check dependencies, generate secrets

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Install

pip install "sreekarnv-fastauth[standard]"

Extra	Includes
standard	FastAPI, JWT (joserfc), SQLAlchemy, Argon2
oauth	httpx (Google, GitHub OAuth)
email	aiosmtplib, Jinja2
redis	redis-py async
postgresql	asyncpg
cli	typer, rich
all	everything

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Quick start

from contextlib import asynccontextmanager
from fastapi import Depends, FastAPI
from fastauth import FastAuth, FastAuthConfig
from fastauth.adapters.sqlalchemy import SQLAlchemyAdapter
from fastauth.api.deps import require_auth
from fastauth.providers.credentials import CredentialsProvider

adapter = SQLAlchemyAdapter(engine_url="sqlite+aiosqlite:///./auth.db")

auth = FastAuth(FastAuthConfig(
    secret="change-me",           # fastauth generate-secret
    providers=[CredentialsProvider()],
    adapter=adapter.user,
    token_adapter=adapter.token,
))

@asynccontextmanager
async def lifespan(app: FastAPI):
    await adapter.create_tables()
    yield

app = FastAPI(lifespan=lifespan)
auth.mount(app)  # registers /auth/signup, /auth/signin, /auth/signout, …

@app.get("/dashboard")
async def dashboard(user=Depends(require_auth)):
    return {"hello": user["email"]}

uvicorn main:app --reload

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Documentation

Full documentation at sreekarnv.github.io/fastauth

• Installation
• Quick Start
• Configuration
• How it Works
• Guides
• API Reference

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License

MIT License - see LICENSE for details.