fastapi-templates

FastAPI project templates organize code into layered components: API routes, core business logic, data models, schemas, services, and repositories. This separation enables maintainability, testability, and scalability by cleanly isolating concerns across the stack.

FastAPI natively supports async route handlers and async database operations through asyncio and async SQLAlchemy. This enables high-performance, non-blocking request handling and concurrent database access without threads.

JWT authentication integrates with FastAPI's dependency injection system via the Depends function. You define security dependencies that verify tokens, then attach them to route handlers to enforce authorization rules and protect endpoints.

A CRUD repository pattern encapsulates all database queries into reusable repository classes, with a service layer on top handling business logic. This architecture decouples data access from API endpoints and simplifies testing.

FastAPI integrates with both PostgreSQL via SQLAlchemy and async drivers, and MongoDB through async ODMs. Templates configure either database backend with connection pooling, migrations, and async query patterns for production workloads.

Pytest with async fixtures and httpx client simulate requests against FastAPI apps. The layered architecture with dependency injection allows mocking repositories and services, enabling isolated unit tests and end-to-end integration tests.