fastapi-users/fastapi-users
Fastapi Users
FastAPI Users is a ready-to-use authentication library for FastAPI applications that handles user registration, login, password reset, email verification, and profile retrieval with minimal configuration. It provides a complete authentication system built around pluggable backends and transports, supporting JWT tokens, database sessions, and Redis-based token storage that can be combined in a single route.
The library distinguishes itself through its modular architecture, offering router-based module composition that organizes authentication flows as independent FastAPI routers for registration, login, verification, and password reset. It supports multiple authentication methods simultaneously, including email-password login, OAuth2 social login through providers like Google and GitHub, and token-based email verification. The system provides dependency-injected authentication flows that chain multiple backends and transports, along with configurable password strength validation hooks that enforce security policies during registration or password changes.
For data persistence, FastAPI Users provides an abstract async storage interface with concrete implementations for SQLAlchemy (relational databases) and Beanie ODM (MongoDB), allowing developers to store user accounts and profiles in either SQL or document databases. The library generates complete OpenAPI documentation for all authentication endpoints, even when multiple backends are configured, and supports both header and cookie transport methods for accepting credentials.
