Nuxt/docs/2.guide/3.going-further/1.experimental-features.md

---
title: "Experimental Features"
description: "Enable Nuxt experimental features to unlock new possibilities."
---

The Nuxt experimental features can be enabled in the Nuxt configuration file.

Internally, Nuxt uses `@nuxt/schema` to define these experimental features. You can refer to the [API documentation](/docs/api/configuration/nuxt-config#experimental) or the [source code](https://github.com/nuxt/nuxt/blob/main/packages/schema/src/config/experimental.ts) for more information.

::callout
Note that these features are experimental and could be removed or modified in the future.
::

## asyncContext

Enable native async context to be accessible for nested composables in Nuxt and in Nitro. This opens the possibility to use composables inside async composables and reduce the chance to get the `Nuxt instance is unavailable` error.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    asyncContext: true
  }
})
```

::read-more{icon="i-simple-icons-github" color="gray" to="https://github.com/nuxt/nuxt/pull/20918" target="_blank"}
See full explanation on the GitHub pull-request.
::

## asyncEntry

Enables generation of an async entry point for the Vue bundle, aiding module federation support.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    asyncEntry: true
  }
})
```

## externalVue

Externalizes `vue`, `@vue/*` and `vue-router` when building.

*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    externalVue: true
  }
})
```

::callout{color="amber" icon="i-ph-warning-duotone"}
This feature will likely be removed in a near future.
::

## treeshakeClientOnly

Tree shakes contents of client-only components from server bundle.

*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    treeshakeClientOnly: true
  }
})
```

## emitRouteChunkError

Emits `app:chunkError` hook when there is an error loading vite/webpack chunks. Default behavior is to perform a hard reload of the new route when a chunk fails to load.

You can disable automatic handling by setting this to `false`, or handle chunk errors manually by setting it to `manual`.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    emitRouteChunkError: 'automatic' // or 'manual' or false
  }
})
```

## restoreState

Allows Nuxt app state to be restored from `sessionStorage` when reloading the page after a chunk error or manual [`reloadNuxtApp()`](/docs/api/utils/reload-nuxt-app) call.

To avoid hydration errors, it will be applied only after the Vue app has been mounted, meaning there may be a flicker on initial load.

::callout{color="amber" icon="i-ph-warning-duotone"}
Consider carefully before enabling this as it can cause unexpected behavior,
and consider providing explicit keys to [`useState`](/docs/api/composables/use-state) as auto-generated keys may not match across builds.
::

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    restoreState: true
  }
})
```

## inlineRouteRules

Define route rules at the page level using [`defineRouteRules`](/docs/api/utils/define-route-rules).

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    inlineRouteRules: true
  }
})
```

Matching route rules will be created, based on the page's `path`.

::read-more{to="/docs/api/utils/define-route-rules" icon="i-ph-function-duotone"}
Read more in `defineRouteRules` utility.
::

:read-more{to="/docs/guide/concepts/rendering#hybrid-rendering" icon="i-ph-medal-duotone"}

## renderJsonPayloads

Allows rendering of JSON payloads with support for revivifying complex types.

*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    renderJsonPayloads: true
  }
})
```

## noVueServer

Disables Vue server renderer endpoint within Nitro.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    noVueServer: true
  }
})
```

## payloadExtraction

Enables extraction of payloads of pages generated with `nuxt generate`.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    payloadExtraction: true
  }
})
```

## clientFallback

Enables the experimental [`<NuxtClientFallback>`](/docs/api/components/nuxt-client-fallback) component for rendering content on the client if there's an error in SSR.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    clientFallback: true
  }
})
```

## crossOriginPrefetch

Enables cross-origin prefetch using the Speculation Rules API.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    crossOriginPrefetch: true
  }
})
```

::read-more{icon="i-simple-icons-w3c" color="gray" to="https://wicg.github.io/nav-speculation/prefetch.html" target="_blank"}
Read more about the **Speculation Rules API**.
::

## viewTransition

Enables View Transition API integration with client-side router.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    viewTransition: true
  }
})
```

:link-example{to="https://stackblitz.com/edit/nuxt-view-transitions?file=app.vue" target="_blank"}

::read-more{icon="i-simple-icons-mdnwebdocs" color="gray" to="https://developer.mozilla.org/en-US/docs/Web/API/View_Transitions_API" target="_blank"}
Read more about the **View Transition API**.
::

## writeEarlyHints

Enables writing of early hints when using node server.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    writeEarlyHints: true
  }
})
```

## componentIslands

Enables experimental component islands support with [`<NuxtIsland>`](/docs/api/components/nuxt-island) and `.island.vue` files.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    componentIslands: true // false or 'local+remote'
  }
})
```

:read-more{to="/docs/guide/directory-structure/components#server-components"}

::read-more{icon="i-simple-icons-github" color="gray" to="https://github.com/nuxt/nuxt/issues/19772" target="_blank"}
You can follow the server components roadmap on GitHub.
::

## configSchema

Enables config schema support.

*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    configSchema: true
  }
})
```

## polyfillVueUseHead

Adds a compatibility layer for modules, plugins, or user code relying on the old `@vueuse/head` API.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    polyfillVueUseHead: false
  }
})
```

## respectNoSSRHeader

Allow disabling Nuxt SSR responses by setting the `x-nuxt-no-ssr` header.

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    respectNoSSRHeader: false
  }
})
```

## localLayerAliases

Resolve `~`, `~~`, `@` and `@@` aliases located within layers with respect to their layer source and root directories.

*Enabled by default.*

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    localLayerAliases: true
  }
})
```

## typedPages

Enable the new experimental typed router using [`unplugin-vue-router`](https://github.com/posva/unplugin-vue-router).

```ts [nuxt.config.ts]
export defineNuxtConfig({
  experimental: {
    typedPages: true
  }
})
```

Out of the box, this will enable typed usage of [`navigateTo`](/docs/api/utils/navigate-to), [`<NuxtLink>`](/docs/api/components/nuxt-link), [`router.push()`](/docs/api/composables/use-router) and more.

You can even get typed params within a page by using `const route = useRoute('route-name')`.

## watcher

Set an alternative watcher that will be used as the watching service for Nuxt.

Nuxt uses `chokidar-granular` by default, which will ignore top-level directories
(like `node_modules` and `.git`) that are excluded from watching.

You can set this instead to `parcel` to use `@parcel/watcher`, which may improve
performance in large projects or on Windows platforms.

You can also set this to `chokidar` to watch all files in your source directory.

```ts [nuxt.config.ts]
export defineNuxtConfig({ 
  experimental: { 
    watcher: 'chokidar-granular' // 'chokidar' or 'parcel' are also options
  } 
}) 
```

## sharedPrerenderData

Enabling this feature automatically shares payload *data* between pages that are prerendered. This can result
in a significant performance improvement when prerendering sites that use `useAsyncData` or `useFetch` and
fetch the same data in different pages.

```ts [nuxt.config.ts]
export defineNuxtConfig({ 
  experimental: { 
    sharedPrerenderData: true
  } 
}) 
```

Note that by default Nuxt will render pages concurrently, meaning this does not guarantee that data will
not be fetched more than once.

It is particularly important when enabling this feature to make sure that any unique key of your data
is always resolvable to the same data. For example, if you are using `useAsyncData` to fetch
data related to a particular page, you should provide a key that uniquely matches that data. (`useFetch`
should do this automatically for you.)

```ts
// This would be unsafe in a dynamic page (e.g. `[slug].vue`) because the route slug makes a difference
// to the data fetched, but Nuxt can't know that because it's not reflected in the key.
const route = useRoute()
const { data } = await useAsyncData(async () => {
  return await $fetch(`/api/my-page/${route.params.slug}`)
})
// Instead, you should use a key that uniquely identifies the data fetched.
const { data } = await useAsyncData(route.params.slug, async () => {
  return await $fetch(`/api/my-page/${route.params.slug}`)
})