Nuxt/docs/6.bridge/7.runtime-config.md

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---
title: Runtime Config
description: 'Nuxt provides a runtime config API to expose configuration and secrets within your application.'
---
::callout{color="amber" icon="i-ph-warning-duotone"}
When using `runtimeConfig` option, [nitro](/docs/bridge/nitro) must have been configured.
::
## Update Runtime Config
Nuxt 3 approaches runtime config differently than Nuxt 2, using a new combined `runtimeConfig` option.
First, you'll need to combine your `publicRuntimeConfig` and `privateRuntimeConfig` properties into a new one called `runtimeConfig`, with the public config within a key called `public`.
```diff
// nuxt.config.js
- privateRuntimeConfig: {
- apiKey: process.env.NUXT_API_KEY || 'super-secret-key'
- },
- publicRuntimeConfig: {
- websiteURL: 'https://public-data.com'
- }
+ runtimeConfig: {
+ apiKey: process.env.NUXT_API_KEY || 'super-secret-key',
+ public: {
+ websiteURL: 'https://public-data.com'
+ }
+ }
```
This also means that when you need to access public runtime config, it's behind a property called `public`. If you use public runtime config, you'll need to update your code.
```diff
// MyWidget.vue
- <div>Website: {{ $config.websiteURL }}</div>
+ <div>Website: {{ $config.public.websiteURL }}</div>
```