Layers let you share partial Nuxt applications across projects. A layer can include components, composables, pages, layouts, middleware, plugins, server routes, and config. Think of them as Nuxt's inheritance model: your project extends one or more layers, and everything merges automatically.

Using a layer

Add it to extends in your config:

// nuxt.config.ts
export default defineNuxtConfig({
  extends: [
    '@my-org/base-layer',          // from npm
    '../shared-layer',              // local directory
    'github:user/repo#main',       // from git
  ]
})

Everything the layer provides (components, composables, pages, etc.) becomes available in your project with no additional configuration.

Creating a layer

A layer is a minimal Nuxt project with a nuxt.config.ts:

my-layer/
├── nuxt.config.ts
├── components/
│   ├── BaseButton.vue
│   └── BaseCard.vue
├── composables/
│   └── useTheme.ts
├── layouts/
│   └── default.vue
├── server/
│   └── api/
│       └── health.get.ts
└── package.json

// my-layer/nuxt.config.ts
export default defineNuxtConfig({
  modules: ['@nuxt/ui']
})

The consuming project gets all components, composables, layouts, and server routes from the layer, plus any modules it declares.

Overriding layer files

Your project always wins over the layer. If the layer provides components/BaseButton.vue and you create the same file, your version takes precedence.

Priority order (highest to lowest):

1. Your project files
2. Layers in extends (first entry wins over later ones)

Auto-scanned layers

Place layers in a layers/ directory and Nuxt discovers them automatically:

my-app/
├── layers/
│   ├── base/
│   │   ├── nuxt.config.ts
│   │   └── components/
│   └── theme/
│       ├── nuxt.config.ts
│       └── composables/
├── nuxt.config.ts
└── pages/

No extends config needed for these.

Practical example: theme layer

A reusable theme shared across multiple apps:

// theme-layer/app.config.ts
export default defineAppConfig({
  theme: {
    primaryColor: '#00dc82',
    darkMode: false
  }
})

// theme-layer/composables/useTheme.ts
export function useTheme() {
  const config = useAppConfig()
  const isDark = useState('dark', () => config.theme.darkMode)
  const toggle = () => isDark.value = !isDark.value
  return { isDark, toggle }
}

The consuming app overrides only what it needs:

// my-app/app.config.ts
export default defineAppConfig({
  theme: {
    primaryColor: '#ff6347' // override, darkMode stays false
  }
})

Publishing as an npm package

{
  "name": "@my-org/base-layer",
  "version": "1.0.0",
  "type": "module",
  "main": "./nuxt.config.ts",
  "dependencies": {
    "@nuxt/ui": "^3.0.0"
  }
}

Then any project can npm install @my-org/base-layer and extend it.

Scaffolding a new layer

npx nuxi init --template layer my-layer

Layers vs modules

	Layer	Module
What it is	A partial Nuxt app (files and config)	A build-time plugin (code that runs during build)
Can provide	Components, pages, layouts, composables, server routes, config	Anything via @nuxt/kit programmatic API
Merging	File-based, automatic	Programmatic, explicit
Override	Replace the file in your project	Configure via module options
Use when	Sharing a base app, design system, or preset across projects	Adding a capability (analytics, auth, image optimization)