Nuxt/docs/content/1.getting-started/3.configuration.md

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---
navigation.icon: uil:wrench
description: Nuxt is configured with sensible defaults. The config file can override or extend them.
---
# Configuration
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.
## Nuxt Configuration
The `nuxt.config.ts` file is located at the root of a Nuxt project and can override or extend the application's behavior.
A minimal configuration file exports the `defineNuxtConfig` function containing an object with your configuration. The `defineNuxtConfig` helper is globally available without import.
```ts [nuxt.config.ts]
export default defineNuxtConfig({
// My Nuxt config
})
```
This file will often be mentioned in the documentation, for example to add custom scripts, register modules or change rendering modes.
::alert{type=info}
Every configuration option is described in the [Configuration Reference](/api/configuration/nuxt-config).
::
::alert{type=info}
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.
::
### Environment Variables and Private Tokens
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.
Those values should be defined in `nuxt.config` and can be overridden using environment variables.
::code-group
```ts [nuxt.config.ts]
export default defineNuxtConfig({
runtimeConfig: {
// The private keys which are only available server-side
apiSecret: '123',
// Keys within public are also exposed client-side
public: {
apiBase: '/api'
}
}
})
```
```text [.env]
# This will override the value of apiSecret
NUXT_API_SECRET=api_secret_token
```
::
These variables are exposed to the rest of your application using the [`useRuntimeConfig`](/api/composables/use-runtime-config) composable.
```vue [pages/index.vue]
<script setup>
const runtimeConfig = useRuntimeConfig()
</script>
```
:ReadMore{link="/guide/going-further/runtime-config"}
## App Configuration
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.
A minimal configuration file exports the `defineAppConfig` function containing an object with your configuration. The `defineAppConfig` helper is globally available without import.
```ts [app.config.ts]
export default defineAppConfig({
title: 'Hello Nuxt',
theme: {
dark: true,
colors: {
primary: '#ff0000'
}
}
})
```
These variables are exposed to the rest of your application using the [`useAppConfig`](/api/composables/use-app-config) composable.
```vue [pages/index.vue]
<script setup>
const appConfig = useAppConfig()
</script>
```
:ReadMore{link="/guide/directory-structure/app.config"}
## `runtimeConfig` vs `app.config`
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:
- `runtimeConfig`: Private or public tokens that need to be specified after build using environment variables.
- `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.
Feature | `runtimeConfig` | `app.config`
-------------------------------|------------------|-------------------
Client Side | Hydrated | Bundled
Environment Variables | ✅ Yes | ❌ No
Reactive | ✅ Yes | ✅ Yes
Types support | ✅ Partial | ✅ Yes
Configuration per Request | ❌ No | ✅ Yes
Hot Module Replacement | ❌ No | ✅ Yes
Non primitive JS types | ❌ No | ✅ Yes