backend.py

from fastapi import FastAPI
from pydantic import BaseModel

app = FastAPI()


@app.get("/")
async def root():
    return {"message": "Hello World"}


@app.get("/hello/{name}")
async def say_hello(name: str):
    return {"message": f"Hello, {name.upper()}"}


class Item(BaseModel):
    name: str
    description: str | None = None
    price: float


@app.post("/items/")
async def create_item(item: Item):
    return item