src/routers/exception_handler.py

from fastapi import Request, status
from fastapi.encoders import jsonable_encoder
from fastapi.responses import JSONResponse


async def validation_exception_handler(request: Request, exc: ValueError):
    return JSONResponse(
        status_code=status.HTTP_400_BAD_REQUEST,
        content=jsonable_encoder({"detail": exc.errors()}),
    )