异步捕获后端错误的正确方法 function

Question

The response.json() from a backend is an data object which can be if request is OK:

{
    "items": [
        {
            "id": "p2",
            "name": "My Second Book",
            "price": 8.98,
            "quantity": 2,
            "totalPrice": 17.96
        },
        {
            "id": "p1",
            "name": "My First Book",
            "price": 6.99,
            "quantity": 3,
            "totalPrice": 20.97
        }
    ],
    "totalQuantity": 5
}

Or if there any error, it responses with this object:

{
    "code": 404,
    "description": "The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.",
    "message": "Not Found"
}

The function for fetching request exports dispatch result.

export function fetchCartData() {
  return async (dispatch) => {
    const fetchData = async () => {
      const response = await fetch("http://127.0.0.1:5000/api/cart");
      const result = await response.json();
      if (!response.ok) {
        console.log(result);
        throw new Error(result);
      } else {
        console.log(result);
        return result;
      }
    };
    try {
      const cartData = await fetchData();
      dispatch(cartActions.replaceCart(cartData));
    } catch (error) {
      // console.log(error);
      dispatch(
        uiActions.showNotification({
          status: "error",
          title: "Error!",
          message: "Fetching cart data failed!",
        })
      );
    }
  };
}

The goal of fetchData function nested is sending GET request to API, store OK or not OK response in constant result and pass it to try-catch for handle response or error.

if response is OK in fetchData function, try dispatch it, but when response is not OK the object result brings information such message: Not Found which I want to pass to catch(error) for replacing in message into 'dispatch(uiActions.showNotification({message:` key.

I tried returning result when response is not OK but it still does not pass object to catch , for example:

if (!response.ok) {
   console.log(result);
   return result;
   }