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114 lines
4.2 KiB
Markdown
114 lines
4.2 KiB
Markdown
---
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navigation.icon: uil:wrench
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description: Nuxt is configured with sensible defaults. The config file can override or extend them.
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---
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# Configuration
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By default, Nuxt is configured to cover most use cases. The [`nuxt.config.ts`](/guide/directory-structure/nuxt.config) file can override or extend this default configuration.
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## Nuxt Configuration
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The `nuxt.config.ts` file is located at the root of a Nuxt project and can override or extend the application's behavior.
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A minimal configuration file exports the `defineNuxtConfig` function containing an object with your configuration. The `defineNuxtConfig` helper is globally available without import.
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```ts [nuxt.config.ts]
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export default defineNuxtConfig({
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// My Nuxt config
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})
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```
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This file will often be mentioned in the documentation, for example to add custom scripts, register modules or change rendering modes.
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::alert{type=info}
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Every configuration option is described in the [Configuration Reference](/api/configuration/nuxt-config).
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::
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::alert{type=info}
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You don't have to use TypeScript to build an application with Nuxt. However, it is strongly recommended to use the `.ts` extension for the `nuxt.config` file. This way you can benefit from hints in your IDE to avoid typos and mistakes while editing your configuration.
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::
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### Environment Variables and Private Tokens
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The `runtimeConfig` API exposes values like environment variables to the rest of your application. By default, these keys are only available server-side. The keys within `runtimeConfig.public` are also available client-side.
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Those values should be defined in `nuxt.config` and can be overridden using environment variables.
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::code-group
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```ts [nuxt.config.ts]
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export default defineNuxtConfig({
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runtimeConfig: {
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// The private keys which are only available server-side
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apiSecret: '123',
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// Keys within public are also exposed client-side
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public: {
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apiBase: '/api'
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}
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}
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})
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```
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```text [.env]
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# This will override the value of apiSecret
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NUXT_API_SECRET=api_secret_token
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```
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::
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These variables are exposed to the rest of your application using the [`useRuntimeConfig`](/api/composables/use-runtime-config) composable.
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```vue [pages/index.vue]
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<script setup>
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const runtimeConfig = useRuntimeConfig()
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</script>
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```
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:ReadMore{link="/guide/going-further/runtime-config"}
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## App Configuration
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The `app.config.ts` file, also located at the root of a Nuxt project, is used to expose public variables that can be determined at build time. Contrary to the `runtimeConfig` option, these can not be overriden using environment variables.
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A minimal configuration file exports the `defineAppConfig` function containing an object with your configuration. The `defineAppConfig` helper is globally available without import.
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```ts [app.config.ts]
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export default defineAppConfig({
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title: 'Hello Nuxt',
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theme: {
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dark: true,
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colors: {
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primary: '#ff0000'
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}
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}
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})
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```
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These variables are exposed to the rest of your application using the [`useAppConfig`](/api/composables/use-app-config) composable.
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```vue [pages/index.vue]
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<script setup>
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const appConfig = useAppConfig()
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</script>
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```
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:ReadMore{link="/guide/directory-structure/app.config"}
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## `runtimeConfig` vs `app.config`
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As stated above, `runtimeConfig` and `app.config` are both used to expose variables to the rest of your application. To determine whether you should use one or the other, here are some guidelines:
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- `runtimeConfig`: Private or public tokens that need to be specified after build using environment variables.
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- `app.config` : Public tokens that are determined at build time, website configuration such as theme variant, title and any project config that are not sensitive.
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Feature | `runtimeConfig` | `app.config`
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-------------------------------|------------------|-------------------
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Client Side | Hydrated | Bundled
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Environment Variables | ✅ Yes | ❌ No
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Reactive | ✅ Yes | ✅ Yes
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Types support | ✅ Partial | ✅ Yes
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Configuration per Request | ❌ No | ✅ Yes
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Hot Module Replacement | ❌ No | ✅ Yes
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Non primitive JS types | ❌ No | ✅ Yes
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