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75 lines
2.6 KiB
Markdown
75 lines
2.6 KiB
Markdown
# `useFetch`
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This composable provides a convenient wrapper around [`useAsyncData`](/api/composables/use-async-data) and [`$fetch`](/api/utils/$fetch). It automatically generates a key based on URL and fetch options, as well as infers API response type.
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## Type
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```ts [Signature]
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function useFetch(
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url: string | Request,
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options?: UseFetchOptions
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): Promise<DataT>
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type UseFetchOptions = {
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key?: string,
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method?: string,
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params?: SearchParams,
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body?: RequestInit['body'] | Record<string, any>
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headers?: {key: string, value: string}[],
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baseURL?: string,
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server?: boolean
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lazy?: boolean
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default?: () => DataT
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transform?: (input: DataT) => DataT
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pick?: string[]
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}
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type DataT = {
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data: Ref<DataT>
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pending: Ref<boolean>
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refresh: () => Promise<void>
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error: Ref<Error | boolean>
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}
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```
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## Params
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* **Url**: The URL to fetch
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* **Options (extends [unjs/ohmyfetch](https://github.com/unjs/ohmyfetch) options & [AsyncDataOptions](/api/composables/use-async-data#params))**:
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* `method`: Request method
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* `params`: Query params
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* `body`: Request body - automatically stringified (if an object is passed).
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* `headers`: Request headers
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* `baseURL`: Base URL for the request
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* **Options (from `useAsyncData`)**:
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* `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
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* `lazy`: Whether to resolve the async function after loading the route, instead of blocking navigation (defaults to `false`).
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* `server`: Whether to fetch the data on the server (defaults to `true`).
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* `default`: A factory function to set the default value of the data, before the async function resolves - particularly useful with the `lazy: true` option.
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* `pick`: Only pick specified keys in this array from the `handler` function result.
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* `transform`: A function that can be used to alter `handler` function result after resolving.
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## Return values
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* **data**: the result of the asynchronous function that is passed in
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* **pending**: a boolean indicating whether the data is still being fetched
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* **refresh**: a function that can be used to refresh the data returned by the `handler` function
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* **error**: an error object if the data fetching failed
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By default, Nuxt waits until a `refresh` is finished before it can be executed again. Passing `true` as parameter skips that wait.
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## Example
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```ts
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const { data, pending, error, refresh } = await useFetch(
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'https://api.nuxtjs.dev/mountains',
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{
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pick: ['title']
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}
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)
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```
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:ReadMore{link="/guide/features/data-fetching"}
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:LinkExample{link="/examples/composables/use-fetch"}
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