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40 lines
1.3 KiB
Markdown
40 lines
1.3 KiB
Markdown
# NuxtApp
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In Nuxt 3, you can access runtime app context within composables, components and plugins.
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In Nuxt 2, this was referred to as [Nuxt context](https://nuxtjs.org/docs/internals-glossary/context#the-context).
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## Accessing NuxtApp
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Within composables, plugins and components you can access `nuxtApp` with `useNuxtApp`:
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```js
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function useMyComposable () {
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const nuxtApp = useNuxtApp()
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// access runtime nuxt app instance
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}
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```
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Plugins also receive `nuxtApp` as the first argument for convenience. [Read more about plugins.](/guide/directory-structure/plugins)
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::alert{icon=👉}
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**`useNuxtApp` (on the server) only works during `setup`, inside Nuxt plugins or `Lifecycle Hooks`**.
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::
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## Providing Helpers
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You can provide helpers to be usable across all composables and application. This usually happens within a Nuxt plugin.
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```js
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const nuxtApp = useNuxtApp()
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nuxtApp.provide('hello', (name) => `Hello ${name}!`)
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console.log(nuxtApp.$hello('name')) // Prints "Hello name!"
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```
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In Nuxt 2 plugins, this was referred to as [inject function](https://nuxtjs.org/docs/directory-structure/plugins#inject-in-root--context).
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::alert{icon=👉}
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It is possible to inject helpers by returning an object with a `provide` key. See the [plugins documentation](/guide/directory-structure/plugins) for more information.
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