Python · async

Async FastAPI with Pydantic v2 and OpenAPI

FastAPI is the async-first Python option. Generated apps use Pydantic v2 DTOs, SQLAlchemy async sessions, dependency-injection auth, and Uvicorn + gunicorn. The auto-generated OpenAPI schema doubles as live API documentation at /docs.

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What's in the generated ZIP

Every FastAPI app generated by Archiet ships with these baseline pieces. No template-cutting, no placeholder TODOs.

Async SQLAlchemy with asyncpg for high-throughput APIs
Pydantic v2 DTOs with field validators and serializers
DI-based auth guards (Depends(get_current_user))
Alembic migrations with async-safe templates
OpenAPI 3.1 + Swagger UI + ReDoc served out of the box
pytest + httpx async client for integration tests
Uvicorn workers behind gunicorn for production
GitHub Actions CI + multi-stage Dockerfile

Sample generated file

One representative file from a generated FastAPI app. Your generated output will include many more files like this one, customized to the entities and flows in your blueprint.

app/routes/items.py

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession
from app.deps import get_session, get_current_user
from app.schemas import ItemCreate, ItemOut

router = APIRouter(prefix="/items", tags=["items"])

@router.post("", response_model=ItemOut, status_code=201)
async def create_item(
    body: ItemCreate,
    db: AsyncSession = Depends(get_session),
    user: User = Depends(get_current_user),
) -> ItemOut:
    item = Item(**body.model_dump(), owner_id=user.id)
    db.add(item)
    await db.commit()
    return item

Why choose FastAPI

Pick FastAPI when throughput matters, your team is comfortable with async, or you want automatic OpenAPI documentation without writing a line of schema.

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Other supported stacks

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What's in the generated ZIP

Every FastAPI app generated by Archiet ships with these baseline pieces. No template-cutting, no placeholder TODOs.

Async SQLAlchemy with asyncpg for high-throughput APIs

Pydantic v2 DTOs with field validators and serializers

DI-based auth guards (Depends(get_current_user))

Alembic migrations with async-safe templates

OpenAPI 3.1 + Swagger UI + ReDoc served out of the box

pytest + httpx async client for integration tests

Uvicorn workers behind gunicorn for production

GitHub Actions CI + multi-stage Dockerfile

Sample generated file

One representative file from a generated FastAPI app. Your generated output will include many more files like this one, customized to the entities and flows in your blueprint.

app/routes/items.py

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession
from app.deps import get_session, get_current_user
from app.schemas import ItemCreate, ItemOut

router = APIRouter(prefix="/items", tags=["items"])

@router.post("", response_model=ItemOut, status_code=201)
async def create_item(
    body: ItemCreate,
    db: AsyncSession = Depends(get_session),
    user: User = Depends(get_current_user),
) -> ItemOut:
    item = Item(**body.model_dump(), owner_id=user.id)
    db.add(item)
    await db.commit()
    return item