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Nuxt/4/Default Data Error Value

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Last update

Sep 15, 2025

Feature Documentation: Updating null Comparisons to undefined

Overview

Default data and error values in useAsyncData and useFetch

What Changed

The data and error objects returned from useAsyncData and useFetch will now default to undefined.

Before and After Examples

Before

const { data, error } = useAsyncData(
  () => client.value.v1.lists.$select(list.value).fetch(),
  {
    default: () => shallowRef(),
  },
);


if (data.value === null) {
  // Handle case where data is null
}


let x =
  data.value === null
    ? "No Data"
    : error.value === null
      ? "Error"
      : "Data Available";

After

const { data, error } = useAsyncData(
  () => client.value.v1.lists.$select(list.value).fetch(),
  {
    default: () => shallowRef(),
  },
);


if (data.value === undefined) {
  // Handle case where data is undefined
}


let x =
  data.value === undefined
    ? "No Data"
    : error.value === undefined
      ? "Error"
      : "Data Available";

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