FastAPI boilerplate generator — async Python production API from your requirements

The official FastAPI tutorials get you to a working API in minutes. Getting a production API for your specific product — with your entities, your auth, your migrations, your tests, your CI/CD — takes weeks. Archiet generates that production FastAPI app from your requirements document.

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.

EU AI Act Annex IV (high-risk AI, deadline August 2026)

Building an AI system with EU market exposure? Start with the free EU AI Act risk classifier, then generate Annex IV technical documentation, risk tier assessment, and post-market monitoring plan from the same FastAPI + Next.js blueprint that produces your app. Same genome → code + compliance artifacts.

• EU AI Act compliance use case
• Annex IV from architecture (GitHub)
• Stack example: Annex IV traceability in FastAPI
• Compliance frameworks hub

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.

Start free at archiet.com.