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49 lines
1.8 KiB
Markdown
49 lines
1.8 KiB
Markdown
---
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title: Plugins and Middleware
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description: 'Learn how to migrate from Nuxt 2 to Nuxt Bridge new plugins and middleware.'
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---
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## New Plugins Format
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You can now migrate to the Nuxt 3 plugins API, which is slightly different in format from Nuxt 2.
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Plugins now take only one argument (`nuxtApp`). You can find out more in [the docs](/docs/guide/directory-structure/plugins).
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```js [plugins/hello.ts]
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export default defineNuxtPlugin(nuxtApp => {
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nuxtApp.provide('injected', () => 'my injected function')
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// now available on `nuxtApp.$injected`
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})
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```
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::callout
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If you want to use the new Nuxt composables (such as [`useNuxtApp`](/docs/api/composables/use-nuxt-app) or `useRuntimeConfig`) within your plugins, you will need to use the `defineNuxtPlugin` helper for those plugins.
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::
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::callout{color="amber" icon="i-ph-warning-duotone"}
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Although a compatibility interface is provided via `nuxtApp.vueApp` you should avoid registering plugins, directives, mixins or components this way without adding your own logic to ensure they are not installed more than once, or this may cause a memory leak.
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::
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## New Middleware Format
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You can now migrate to the Nuxt 3 middleware API, which is slightly different in format from Nuxt 2.
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Middleware now take only two argument (`to`, `from`). You can find out more in [the docs](/docs/guide/directory-structure/middleware).
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```ts twoslash
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export default defineNuxtRouteMiddleware((to) => {
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if (to.path !== '/') {
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return navigateTo('/')
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}
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})
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```
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::callout{color="amber" icon="i-ph-warning-duotone"}
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Use of `defineNuxtRouteMiddleware` is not supported outside of the middleware directory.
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::
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::callout
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You can also use [`definePageMeta`](https://nuxt.com/docs/api/utils/define-page-meta) in Nuxt Bridge.
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But only for `middleware` and `layout`.
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::
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