FastAPI boilerplate generator — async Python production API from your requirements

What the generated FastAPI app contains

Application structure

app/
├── main.py                    # FastAPI app + lifespan + middleware
├── database.py                # Async SQLAlchemy engine + session factory
├── dependencies.py            # get_db(), get_current_user() FastAPI deps
├── config.py                  # Settings via pydantic-settings + os.getenv()
├── models/
│   ├── user.py                # User, Role, Workspace (with relationships)
│   └── {entity}.py           # SQLAlchemy model per entity in your PRD
├── schemas/
│   ├── user.py                # Pydantic request/response schemas
│   └── {entity}.py           # Pydantic schemas per entity
├── routers/
│   ├── auth.py                # login, register, refresh, logout
│   └── {entity}.py           # CRUD router per entity
└── services/
    ├── auth_service.py
    └── {entity}_service.py   # business logic per entity

Async SQLAlchemy + Alembic

• AsyncSession with create_async_engine (asyncpg driver)
• Alembic migration for every model and field change — async-aware env.py
• All foreign key columns indexed
• Multi-tenant filter on every query: .where(Entity.workspace_id == workspace_id)
• Relationship loading via selectinload — no N+1 queries
• PostgreSQL — never SQLite

Auth with FastAPI dependencies

• get_current_user: Annotated[User, Depends(get_current_user_dep)] on every protected route
• JWT in httpOnly, Secure, SameSite=Lax cookies — never in response body for storage
• python-jose for JWT operations; passlib[bcrypt] for password hashing
• Refresh token rotation with Redis (when caching is in the genome)
• OAuth2PasswordBearer for Swagger UI testing (dev only)

Pydantic schemas and validation

• Input schemas inherit from BaseModel with model_config = ConfigDict(from_attributes=True)
• model_validator for cross-field validation
• Response schemas separate from request schemas — no accidental field exposure
• 422 Unprocessable Entity returned automatically by FastAPI when validation fails

Auto-generated OpenAPI documentation

• Swagger UI at /docs — interactive API explorer
• ReDoc at /redoc — readable API reference
• Every endpoint: summary, description, request/response schemas, error responses
• The generated openapi.yaml in the repo root is the authoritative spec

Tests

• pytest-asyncio test suite with async fixtures
• AsyncClient (httpx) for route tests against test app
• Factory functions for entity fixtures
• Auth tests: register → login → protected route → logout → 401
• Multi-tenant isolation tests: workspace A cannot read workspace B's data

Infrastructure

• Multi-stage Dockerfile (Python slim → production)
• docker-compose.yml: FastAPI app + PostgreSQL + Redis
• pyproject.toml with Ruff + pylint configuration
• GitHub Actions: ruff lint → pylint → pytest → build → deploy

FastAPI vs Flask — the key differences in generated code

| Aspect | FastAPI | Flask | |--------|---------|-------| | Async | Native async/await throughout | Synchronous (or gevent/eventlet) | | Validation | Pydantic built-in | Marshmallow / manual | | OpenAPI docs | Auto-generated, always current | Manual maintenance | | Type safety | Full type hints throughout | Optional | | Performance | High throughput via async | Good for standard web apps | | Learning curve | Requires async Python knowledge | Lower entry bar |

Both are generated by Archiet. Pick the right one for your team and requirements.

vs fastapi-fullstack, fastapi-boilerplate GitHub repos

Popular GitHub FastAPI boilerplates (fastapi-fullstack, tiangolo's full-stack template, FastAPI-boilerplate) wire up the framework plumbing correctly. What they contain is a todo app or a user management demo — not your product.

Archiet generates the product layer: your entities, your business logic, your routes, your tests, based on your requirements document. The framework plumbing is included; so is your app.

CTA

Generate a complete FastAPI + Next.js application from your requirements — free plan, no credit card.

Describe your product or upload a PRD, pick FastAPI + Next.js, download a production-ready async Python codebase in 90 seconds.

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