Nuxt/docs/content/3.api/1.composables/use-fetch.md

useFetch

This composable provides a convenient wrapper around useAsyncData and $fetch. It automatically generates a key based on URL and fetch options, as well as infers API response type.

Type

function useFetch(
  url: string | Request,
  options?: UseFetchOptions
): Promise<DataT>

type UseFetchOptions = {
  key?: string,
  method?: string,
  params?: SearchParams,
  body?: RequestInit['body'] | Record<string, any>
  headers?: {key: string, value: string}[],
  baseURL?: string,
  server?: boolean
  lazy?: boolean
  default?: () => DataT
  transform?: (input: DataT) => DataT
  pick?: string[]
  watch?: WatchSource[]
}

type DataT = {
  data: Ref<DataT>
  pending: Ref<boolean>
  refresh: () => Promise<void>
  error: Ref<Error | boolean>
}

Params

• Url: The URL to fetch
• Options (extends unjs/ohmyfetch options & AsyncDataOptions):
  • method: Request method
  • params: Query params
  • body: Request body - automatically stringified (if an object is passed).
  • headers: Request headers
  • baseURL: Base URL for the request
• Options (from useAsyncData):
  • key: a unique key to ensure that data fetching can be properly de-duplicated across requests, if not provided, it will be generated based on the url and fetch options
  • lazy: Whether to resolve the async function after loading the route, instead of blocking navigation (defaults to false).
  • server: Whether to fetch the data on the server (defaults to true).
  • default: A factory function to set the default value of the data, before the async function resolves - particularly useful with the lazy: true option.
  • pick: Only pick specified keys in this array from the handler function result.
  • watch: watch reactive sources to auto-refresh
  • transform: A function that can be used to alter handler function result after resolving.

Return values

• data: the result of the asynchronous function that is passed in
• pending: a boolean indicating whether the data is still being fetched
• refresh: a function that can be used to refresh the data returned by the handler function
• error: an error object if the data fetching failed

By default, Nuxt waits until a refresh is finished before it can be executed again. Passing true as parameter skips that wait.

Example

const { data, pending, error, refresh } = await useFetch(
  'https://api.nuxtjs.dev/mountains',
  {
    pick: ['title']
  }
)

:ReadMore{link="/guide/features/data-fetching"}

:LinkExample{link="/examples/composables/use-fetch"}