fastapi_helloworld.py

from fastapi import FastAPI, Response
from fastapi.responses import JSONResponse

app = FastAPI(title="Demo REST Server")

@app.get("/hello")
async def hello() -> Response:
    return JSONResponse({"message": "Hello, World"})

@app.get("/get_user/{user_id}")
async def get_user(user_id: int) -> Response:
    return JSONResponse({"message": f"You requested data of {user_id}"})