function-api-builder 0.1.0

Generate complete FastAPI applications from decorated Python business functions.

API Builder

Generate a FastAPI application from decorated Python business functions.

Install

pip install function-api-builder

Use

Create functions/example.py in your project:

from pydantic import BaseModel
from api_builder_runtime import function


class Input(BaseModel):
    value: str


class Output(BaseModel):
    result: str


@function(service="example", step=1)
def run(payload: Input, deps, context) -> Output:
    return Output(result=payload.value)

Then run:

api-builder

The builder writes a complete app/ FastAPI application with a public service route, optional local development routes, health checks, OpenAPI, and generated tests.

The function signature must be (payload, deps, context), with Pydantic models for the payload and return value. See examples/basic/functions/pdf_summary.py for a multi-step service.