Full example

Here is a full working example with JWT authentication to help get you started.

Warning

Notice that SECRET should be changed to a strong passphrase. Insecure passwords may give attackers full access to your database.

SQLAlchemy

import databases
import sqlalchemy
from fastapi import FastAPI, Request
from fastapi_users import FastAPIUsers, models
from fastapi_users.authentication import JWTAuthentication
from fastapi_users.db import SQLAlchemyBaseUserTable, SQLAlchemyUserDatabase
from sqlalchemy.ext.declarative import DeclarativeMeta, declarative_base

DATABASE_URL = "sqlite:///./test.db"
SECRET = "SECRET"


class User(models.BaseUser):
    pass


class UserCreate(models.BaseUserCreate):
    pass


class UserUpdate(User, models.BaseUserUpdate):
    pass


class UserDB(User, models.BaseUserDB):
    pass


database = databases.Database(DATABASE_URL)
Base: DeclarativeMeta = declarative_base()


class UserTable(Base, SQLAlchemyBaseUserTable):
    pass


engine = sqlalchemy.create_engine(
    DATABASE_URL, connect_args={"check_same_thread": False}
)
Base.metadata.create_all(engine)

users = UserTable.__table__
user_db = SQLAlchemyUserDatabase(UserDB, database, users)


def on_after_register(user: UserDB, request: Request):
    print(f"User {user.id} has registered.")


def on_after_forgot_password(user: UserDB, token: str, request: Request):
    print(f"User {user.id} has forgot their password. Reset token: {token}")


jwt_authentication = JWTAuthentication(
    secret=SECRET, lifetime_seconds=3600, tokenUrl="/auth/jwt/login"
)

app = FastAPI()
fastapi_users = FastAPIUsers(
    user_db, [jwt_authentication], User, UserCreate, UserUpdate, UserDB,
)
app.include_router(
    fastapi_users.get_auth_router(jwt_authentication), prefix="/auth/jwt", tags=["auth"]
)
app.include_router(
    fastapi_users.get_register_router(on_after_register), prefix="/auth", tags=["auth"]
)
app.include_router(
    fastapi_users.get_reset_password_router(
        SECRET, after_forgot_password=on_after_forgot_password
    ),
    prefix="/auth",
    tags=["auth"],
)
app.include_router(fastapi_users.get_users_router(), prefix="/users", tags=["users"])


@app.on_event("startup")
async def startup():
    await database.connect()


@app.on_event("shutdown")
async def shutdown():
    await database.disconnect()

MongoDB

import motor.motor_asyncio
from fastapi import FastAPI, Request
from fastapi_users import FastAPIUsers, models
from fastapi_users.authentication import JWTAuthentication
from fastapi_users.db import MongoDBUserDatabase

DATABASE_URL = "mongodb://localhost:27017"
SECRET = "SECRET"


class User(models.BaseUser):
    pass


class UserCreate(models.BaseUserCreate):
    pass


class UserUpdate(User, models.BaseUserUpdate):
    pass


class UserDB(User, models.BaseUserDB):
    pass


client = motor.motor_asyncio.AsyncIOMotorClient(
    DATABASE_URL, uuidRepresentation="standard"
)
db = client["database_name"]
collection = db["users"]
user_db = MongoDBUserDatabase(UserDB, collection)


def on_after_register(user: UserDB, request: Request):
    print(f"User {user.id} has registered.")


def on_after_forgot_password(user: UserDB, token: str, request: Request):
    print(f"User {user.id} has forgot their password. Reset token: {token}")


jwt_authentication = JWTAuthentication(
    secret=SECRET, lifetime_seconds=3600, tokenUrl="/auth/jwt/login"
)

app = FastAPI()
fastapi_users = FastAPIUsers(
    user_db, [jwt_authentication], User, UserCreate, UserUpdate, UserDB,
)
app.include_router(
    fastapi_users.get_auth_router(jwt_authentication), prefix="/auth/jwt", tags=["auth"]
)
app.include_router(
    fastapi_users.get_register_router(on_after_register), prefix="/auth", tags=["auth"]
)
app.include_router(
    fastapi_users.get_reset_password_router(
        SECRET, after_forgot_password=on_after_forgot_password
    ),
    prefix="/auth",
    tags=["auth"],
)
app.include_router(fastapi_users.get_users_router(), prefix="/users", tags=["users"])

Tortoise ORM

from fastapi import FastAPI, Request
from fastapi_users import FastAPIUsers, models
from fastapi_users.authentication import JWTAuthentication
from fastapi_users.db import TortoiseBaseUserModel, TortoiseUserDatabase
from tortoise.contrib.starlette import register_tortoise

DATABASE_URL = "sqlite://./test.db"
SECRET = "SECRET"


class User(models.BaseUser):
    pass


class UserCreate(models.BaseUserCreate):
    pass


class UserUpdate(User, models.BaseUserUpdate):
    pass


class UserDB(User, models.BaseUserDB):
    pass


class UserModel(TortoiseBaseUserModel):
    pass


user_db = TortoiseUserDatabase(UserDB, UserModel)
app = FastAPI()
register_tortoise(app, db_url=DATABASE_URL, modules={"models": ["test"]})


def on_after_register(user: UserDB, request: Request):
    print(f"User {user.id} has registered.")


def on_after_forgot_password(user: UserDB, token: str, request: Request):
    print(f"User {user.id} has forgot their password. Reset token: {token}")


jwt_authentication = JWTAuthentication(
    secret=SECRET, lifetime_seconds=3600, tokenUrl="/auth/jwt/login"
)

fastapi_users = FastAPIUsers(
    user_db, [jwt_authentication], User, UserCreate, UserUpdate, UserDB,
)
app.include_router(
    fastapi_users.get_auth_router(jwt_authentication), prefix="/auth/jwt", tags=["auth"]
)
app.include_router(
    fastapi_users.get_register_router(on_after_register), prefix="/auth", tags=["auth"]
)
app.include_router(
    fastapi_users.get_reset_password_router(
        SECRET, after_forgot_password=on_after_forgot_password
    ),
    prefix="/auth",
    tags=["auth"],
)
app.include_router(fastapi_users.get_users_router(), prefix="/users", tags=["users"])

What now?

You're ready to go! Be sure to check the Usage section to understand how yo work with FastAPI Users.