This composable provides a convenient wrapper around [`useAsyncData`](/docs/api/composables/use-async-data) and [`$fetch`](/docs/api/utils/dollarfetch).
It automatically generates a key based on URL and fetch options, provides type hints for request url based on server routes, and infers API response type.
`useFetch` is a composable meant to be called directly in a setup function, plugin, or route middleware. It returns reactive composables and handles adding responses to the Nuxt payload so they can be passed from server to client without re-fetching the data on client side when the page hydrates.
If you're using a custom useFetch wrapper, do not await it in the composable, as that can cause unexpected behavior. Please follow [this recipe](/docs/guide/recipes/custom-usefetch#custom-usefetch) for more information on how to make a custom async data fetcher.
`data`, `status` and `error` are Vue refs and they should be accessed with `.value` when used within the `<script setup>`, while `refresh`/`execute` and `clear` are plain functions..
Using the `query` option, you can add search parameters to your query. This option is extended from [unjs/ofetch](https://github.com/unjs/ofetch) and is using [unjs/ufo](https://github.com/unjs/ufo) to create the URL. Objects are automatically stringified.
-`cache`: Handles cache control according to [Fetch API](https://developer.mozilla.org/en-US/docs/Web/API/fetch#cache)
- You can pass boolean to disable the cache or you can pass one of the following values: `default`, `no-store`, `reload`, `no-cache`, `force-cache`, and `only-if-cached`.
All fetch options can be given a `computed` or `ref` value. These will be watched and new requests made automatically with any new values if they are updated.
-`key`: a unique key to ensure that data fetching can be properly de-duplicated across requests, if not provided, it will be automatically generated based on URL and fetch options
-`server`: whether to fetch the data on the server (defaults to `true`)
-`lazy`: whether to resolve the async function after loading the route, instead of blocking client-side navigation (defaults to `false`)
-`immediate`: when set to `false`, will prevent the request from firing immediately. (defaults to `true`)
-`default`: a factory function to set the default value of the `data`, before the async function resolves - useful with the `lazy: true` or `immediate: false` option
-`transform`: a function that can be used to alter `handler` function result after resolving
-`getCachedData`: Provide a function which returns cached data. A _null_ or _undefined_ return value will trigger a fetch. By default, this is: `key => nuxt.isHydrating ? nuxt.payload.data[key] : nuxt.static.data[key]`, which only caches data when `payloadExtraction` is enabled.
-`watch`: watch an array of reactive sources and auto-refresh the fetch result when they change. Fetch options and URL are watched by default. You can completely ignore reactive sources by using `watch: false`. Together with `immediate: false`, this allows for a fully-manual `useFetch`. (You can [see an example here](/docs/getting-started/data-fetching#watch) of using `watch`.)
-`deep`: return data in a deep ref object (it is `true` by default). It can be set to `false` to return data in a shallow ref object, which can improve performance if your data does not need to be deeply reactive.
If you provide a function or ref as the `url` parameter, or if you provide functions as arguments to the `options` parameter, then the `useFetch` call will not match other `useFetch` calls elsewhere in your codebase, even if the options seem to be identical. If you wish to force a match, you may provide your own key in `options`.
If you use `useFetch` to call an (external) HTTPS URL with a self-signed certificate in development, you will need to set `NODE_TLS_REJECT_UNAUTHORIZED=0` in your environment.
-`clear`: a function which will set `data` to `undefined`, set `error` to `null`, set `status` to `'idle'`, and mark any currently pending requests as cancelled.
If you have not fetched data on the server (for example, with `server: false`), then the data _will not_ be fetched until hydration completes. This means even if you await `useFetch` on client-side, `data` will remain null within `<script setup>`.
