Nuxt/docs/2.guide/2.directory-structure/1.plugins.md

---
title: "plugins"
description: "Nuxt has a plugins system to use Vue plugins and more at the creation of your Vue application."
head.title: "plugins/"
navigation.icon: i-ph-folder-duotone
---

Nuxt automatically reads the files in the `plugins/` directory and loads them at the creation of the Vue application.

::callout{color="blue" icon="i-ph-info-duotone"}
All plugins inside are auto-registered, you don't need not add them to your `nuxt.config` separately.
::

::callout{color="yellow" icon="i-ph-lightbulb-duotone"}
You can use `.server` or `.client` suffix in the file name to load a plugin only on the server or client side.
::

## Registered Plugins

Only files at the top level of the directory (or index files within any subdirectories) will be auto-registered as plugins.

```bash [Directory sturcture]
-| plugins/
---| foo.ts      // scanned
---| bar/
-----| baz.ts    // not scanned
-----| foz.vue   // not scanned
-----| index.ts  // currently scanned but deprecated
```

Only `foo.ts` and `bar/index.ts` would be registered.

To add plugins in subdirectories, you can use the [`plugins`](/docs/api/nuxt-config#plugins-1) option in `nuxt.config.ts`:

```ts [nuxt.config.ts]
export default defineNuxtConfig({
  plugins: [
    '~/plugins/bar/baz',
    '~/plugins/bar/foz'
  ]
})
```

## Creating Plugins

The only argument passed to a plugin is [`nuxtApp`](/docs/api/composables/use-nuxt-app).

```ts [plugins/hello.ts]
export default defineNuxtPlugin(nuxtApp => {
  // Doing something with nuxtApp
})
```

### Object Syntax Plugins

It is also possible to define a plugin using an object syntax, for more advanced use cases. For example:

```ts [plugins/hello.ts]
export default defineNuxtPlugin({
  name: 'my-plugin',
  enforce: 'pre', // or 'post'
  async setup (nuxtApp) {
    // this is the equivalent of a normal functional plugin
  },
  hooks: {
    // You can directly register Nuxt app runtime hooks here
    'app:created'() {
      const nuxtApp = useNuxtApp()
      // do something in the hook
    }
  },
  env: {
    // Set this value to `false` if you don't want the plugin to run when rendering server-only or island components.
    islands: true
  }
})
```

::callout
If you are using the object-syntax, the properties may be statically analyzed in future to produce a more optimized build. So you should not define them at runtime. :br
For example, setting `enforce: process.server ? 'pre' : 'post'` would defeat any future optimization Nuxt is able to do for your plugins.
::

## Registration Order

You can control the order in which plugins are registered by prefixing with 'alphabetical' numbering to the file names.

```bash [Directory structure]
plugins/
 | - 01.myPlugin.ts
 | - 02.myOtherPlugin.ts
```

In this example, `02.myOtherPlugin.ts` will be able to access anything that was injected by `01.myPlugin.ts`.

This is useful in situations where you have a plugin that depends on another plugin.

::callout{color="blue" icon="i-ph-info-duotone"}
In case you're new to 'alphabetical' numbering, remember that filenames are sorted as strings, not as numeric values. For example, `10.myPlugin.ts` would come before `2.myOtherPlugin.ts`. This is why the example prefixes single digit numbers with `0`.
::

## Loading Strategy

### Parallel Plugins

By default, Nuxt loads plugins sequentially. You can define a plugin as `parallel` so Nuxt won't wait the end of the plugin's execution before loading the next plugin.

```ts [plugins/my-plugin.ts]
export default defineNuxtPlugin({
  name: 'my-plugin',
  parallel: true,
  async setup (nuxtApp) {
    // the next plugin will be executed immediately
  }
})
```

### Plugins With Dependencies

If a plugin needs to await a parallel plugin before it runs, you can add the plugin's name to the `dependsOn` array.

```ts [plugins/depending-on-my-plugin.ts]
export default defineNuxtPlugin({
  name: 'depends-on-my-plugin',
  dependsOn: ['my-plugin']
  async setup (nuxtApp) {
    // this plugin will wait for the end of `my-plugin`'s execution before it runs
  }
})
```

## Using Composables

You can use [composables](/docs/guide/directory-structure/composables) as well as [utils](/docs/guide/directory-structure/utils) within Nuxt plugins:

```ts [plugins/hello.ts]
export default defineNuxtPlugin((nuxtApp) => {
  const foo = useFoo()
})
```

However, keep in mind there are some limitations and differences:

::callout
**If a composable depends on another plugin registered later, it might not work.** :br

Plugins are called in order sequentially and before everything else. You might use a composable that depends on another plugin which has not been called yet.
::

::callout
**If a composable depends on the Vue.js lifecycle, it won't work.** :br

Normally, Vue.js composables are bound to the current component instance while plugins are only bound to [`nuxtApp`](/docs/api/composables/use-nuxt-app) instance.
::

## Providing Helpers

If you would like to provide a helper on the [`NuxtApp`](/docs/api/composables/use-nuxt-app) instance, return it from the plugin under a `provide` key.

```ts [plugins/hello.ts]
export default defineNuxtPlugin(() => {
  return {
    provide: {
      hello: (msg: string) => `Hello ${msg}!`
    }
  }
})
```

You can then use the helper in your components:

```vue [components/Hello.vue]
<script setup lang="ts">
// alternatively, you can also use it here
const { $hello } = useNuxtApp()
</script>

<template>
  <div>
    {{ $hello('world') }}
  </div>
</template>
```

::callout{color="amber" icon="i-ph-warning-duotone"}
Note that we highly recommend using [`composables`](/docs/guide/directory-structure/composables) instead of providing helpers to avoid polluting the global namespace and keep your main bundle entry small.
::

## Typing Plugins

If you return your helpers from the plugin, they will be typed automatically; you'll find them typed for the return of `useNuxtApp()` and within your templates.

::callout
If you need to use a provided helper _within_ another plugin, you can call [`useNuxtApp()`](/docs/api/composables/use-nuxt-app) to get the typed version. But in general, this should be avoided unless you are certain of the plugins' order.
::

For advanced use-cases, you can declare the type of injected properties like this:

```ts [index.d.ts]
declare module '#app' {
  interface NuxtApp {
    $hello (msg: string): string
  }
}

declare module 'vue' {
  interface ComponentCustomProperties {
    $hello (msg: string): string
  }
}

export {}
```

::callout
If you are using WebStorm, you may need to augment `@vue/runtime-core` until [this issue](https://youtrack.jetbrains.com/issue/WEB-59818/VUE-TypeScript-WS-PS-does-not-correctly-display-type-of-globally-injected-properties) is resolved.
::

## Vue Plugins

If you want to use Vue plugins, like [vue-gtag](https://github.com/MatteoGabriele/vue-gtag) to add Google Analytics tags, you can use a Nuxt plugin to do so.

First, install the Vue plugin dependency:

::code-group
```bash [yarn]
yarn add --dev vue-gtag-next
```
```bash [npm]
npm install --save-dev vue-gtag-next
```
```bash [pnpm]
pnpm add -D vue-gtag-next
```
```bash [bun]
bun add -D vue-gtag-next
```
::

Then create a plugin file:

```ts [plugins/vue-gtag.client.ts]
import VueGtag, { trackRouter } from 'vue-gtag-next'

export default defineNuxtPlugin((nuxtApp) => {
  nuxtApp.vueApp.use(VueGtag, {
    property: {
      id: 'GA_MEASUREMENT_ID'
    }
  })
  trackRouter(useRouter())
})
```

## Vue Directives

Similarly, you can register a custom Vue directive in a plugin.

```ts [plugins/my-directive.ts]
export default defineNuxtPlugin((nuxtApp) => {
  nuxtApp.vueApp.directive('focus', {
    mounted (el) {
      el.focus()
    },
    getSSRProps (binding, vnode) {
      // you can provide SSR-specific props here
      return {}
    }
  })
})
```

::callout{color="amber" icon="i-ph-warning-duotone"}
If you register a Vue directive, you _must_ register it on both client and server side unless you are only using it when rendering one side. If the directive only makes sense from a client side, you can always move it to `~/plugins/my-directive.client.ts` and provide a 'stub' directive for the server in `~/plugins/my-directive.server.ts`.
::

:read-more{icon="i-simple-icons-vuedotjs" title="Custom Directives on Vue Docs" to="https://vuejs.org/guide/reusability/custom-directives.html" target="_blank"}