Nuxt/docs/content/1.docs/1.getting-started/9.layers.md

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---
navigation.icon: uil:layer-group
description: Nuxt provides a powerful system that allows you to extend the default files, configs, and much more.
---
# Layers
One of the core features of Nuxt 3 is the layers and extending support. You can extend a default Nuxt application to reuse components, utils, and configuration. The layers structure is almost identical to a standard Nuxt application which makes them easy to author and maintain. Some example use cases:
::list{type="success"}
- Share reusable configuration presets across projects using `nuxt.config` and `app.config`
- Create a component library using `components/` directory
- Create utility and composable library using `composables/` and `utils/` directories
- Create Nuxt themes
- Create Nuxt module presets
- Share standard setup across projects
::
You can extend a layer by adding the [extends](/docs/api/configuration/nuxt-config#extends) property to the `nuxt.config.ts` file.
```ts{}[app/nuxt.config.ts]
export default defineNuxtConfig({
extends: [
'../base', // Extend from a local layer
'@my-themes/awesome', // Extend from an installed npm package
'github:my-themes/awesome#v1', // Extend from a git repository
]
})
```
## Authoring Nuxt Layers
See [Layer Author Guide](/docs/guide/going-further/layers) to learn more.
## Examples
- [Nuxt Docus Theme](https://github.com/nuxt-themes/docus#readme)
- [Nuxt Content Wind Theme](https://github.com/Atinux/content-wind#readme)