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64 lines
1.7 KiB
Markdown
64 lines
1.7 KiB
Markdown
---
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head.title: 'Nuxt 2 to Nuxt 3: Runtime Config'
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head.titleTemplate: ''
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---
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# Runtime Config
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If you wish to reference environment variables within your Nuxt 3 app, you will need to use runtime config.
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When referencing these variables within your components, you will have to use the `useRuntimeConfig` composable in your setup method (or Nuxt plugin). In the `server/` portion of your app, you can use `useRuntimeConfig` without any import.
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[Read more about runtime config](/guide/features/runtime-config).
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## Migration
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1. Add any environment variables that you use in your app to the `runtimeConfig` property of the `nuxt.config` file.
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1. Migrate `process.env` to `useRuntimeConfig` throughout the Vue part of your app.
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## Example
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::code-group
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```ts [nuxt.config.ts]
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import { defineNuxtConfig } from 'nuxt'
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export default defineNuxtConfig({
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runtimeConfig: {
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// Private config that is only available on the server
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apiSecret: '123',
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// Config within public will be also exposed to the client
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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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```vue [pages/index.vue]
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<script setup>
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const config = useRuntimeConfig()
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// instead of process.env you will now access config.public.apiBase
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console.log(config.public.apiBase)
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</script>
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```
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```ts [server/api/hello.ts]
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const config = useRuntimeConfig()
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export default (req, res) => {
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// In server, you can now access config.apiSecret, in addition to config.public
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console.log(config.apiSecret)
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console.log(config.public.apiBase)
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}
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```
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```ini [.env]
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# Runtime config values are automatically replaced by matching environment variables at runtime
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NUXT_API_SECRET=api_secret_token
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NUXT_PUBLIC_API_BASE=https://nuxtjs.org
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```
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::
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