mirror of
https://github.com/nuxt/nuxt.git
synced 2024-12-05 03:47:12 +00:00
143 lines
4.0 KiB
Markdown
143 lines
4.0 KiB
Markdown
---
|
|
title: 'useRuntimeConfig'
|
|
description: 'Access runtime config variables with the useRuntimeConfig composable.'
|
|
links:
|
|
- label: Source
|
|
icon: i-simple-icons-github
|
|
to: https://github.com/nuxt/nuxt/blob/main/packages/nuxt/src/app/nuxt.ts
|
|
size: xs
|
|
---
|
|
|
|
## Usage
|
|
|
|
```vue [app.vue]
|
|
<script setup lang="ts">
|
|
const config = useRuntimeConfig()
|
|
</script>
|
|
```
|
|
|
|
```ts [server/api/foo.ts]
|
|
export default defineEventHandler((event) => {
|
|
const config = useRuntimeConfig(event)
|
|
})
|
|
```
|
|
|
|
:read-more{to="/docs/guide/going-further/runtime-config"}
|
|
|
|
## Define Runtime Config
|
|
|
|
The example below shows how to set a public API base URL and a secret API token that is only accessible on the server.
|
|
|
|
We should always define `runtimeConfig` variables inside `nuxt.config`.
|
|
|
|
```ts [nuxt.config.ts]
|
|
export default defineNuxtConfig({
|
|
runtimeConfig: {
|
|
// Private keys are only available on the server
|
|
apiSecret: '123',
|
|
|
|
// Public keys that are exposed to the client
|
|
public: {
|
|
apiBase: process.env.NUXT_PUBLIC_API_BASE || '/api'
|
|
}
|
|
}
|
|
})
|
|
```
|
|
|
|
::note
|
|
Variables that need to be accessible on the server are added directly inside `runtimeConfig`. Variables that need to be accessible on both the client and the server are defined in `runtimeConfig.public`.
|
|
::
|
|
|
|
:read-more{to="/docs/guide/going-further/runtime-config"}
|
|
|
|
## Access Runtime Config
|
|
|
|
To access runtime config, we can use `useRuntimeConfig()` composable:
|
|
|
|
```ts [server/api/test.ts]
|
|
export default defineEventHandler((event) => {
|
|
const config = useRuntimeConfig(event)
|
|
|
|
// Access public variables
|
|
const result = await $fetch(`/test`, {
|
|
baseURL: config.public.apiBase,
|
|
headers: {
|
|
// Access a private variable (only available on the server)
|
|
Authorization: `Bearer ${config.apiSecret}`
|
|
}
|
|
})
|
|
return result
|
|
}
|
|
```
|
|
|
|
In this example, since `apiBase` is defined within the `public` namespace, it is universally accessible on both server and client-side, while `apiSecret` **is only accessible on the server-side**.
|
|
|
|
## Environment Variables
|
|
|
|
It is possible to update runtime config values using a matching environment variable name prefixed with `NUXT_`.
|
|
|
|
:read-more{to="/docs/guide/going-further/runtime-config"}
|
|
|
|
### Using the `.env` File
|
|
|
|
We can set the environment variables inside the `.env` file to make them accessible during **development** and **build/generate**.
|
|
|
|
``` [.env]
|
|
NUXT_PUBLIC_API_BASE = "https://api.localhost:5555"
|
|
NUXT_API_SECRET = "123"
|
|
```
|
|
|
|
::note
|
|
Any environment variables set within `.env` file are accessed using `process.env` in the Nuxt app during **development** and **build/generate**.
|
|
::
|
|
|
|
::warning
|
|
In **production runtime**, you should use platform environment variables and `.env` is not used.
|
|
::
|
|
|
|
:read-more{to="/docs/guide/directory-structure/env"}
|
|
|
|
## `app` namespace
|
|
|
|
Nuxt uses `app` namespace in runtime-config with keys including `baseURL` and `cdnURL`. You can customize their values at runtime by setting environment variables.
|
|
|
|
::note
|
|
This is a reserved namespace. You should not introduce additional keys inside `app`.
|
|
::
|
|
|
|
### `app.baseURL`
|
|
|
|
By default, the `baseURL` is set to `'/'`.
|
|
|
|
However, the `baseURL` can be updated at runtime by setting the `NUXT_APP_BASE_URL` as an environment variable.
|
|
|
|
Then, you can access this new base URL using `config.app.baseURL`:
|
|
|
|
```ts [/plugins/my-plugin.ts]
|
|
export default defineNuxtPlugin((NuxtApp) => {
|
|
const config = useRuntimeConfig()
|
|
|
|
// Access baseURL universally
|
|
const baseURL = config.app.baseURL
|
|
})
|
|
```
|
|
|
|
### `app.cdnURL`
|
|
|
|
This example shows how to set a custom CDN url and access them using `useRuntimeConfig()`.
|
|
|
|
You can use a custom CDN for serving static assets inside `.output/public` using the `NUXT_APP_CDN_URL` environment variable.
|
|
|
|
And then access the new CDN url using `config.app.cdnURL`.
|
|
|
|
```ts [server/api/foo.ts]
|
|
export default defineEventHandler((event) => {
|
|
const config = useRuntimeConfig(event)
|
|
|
|
// Access cdnURL universally
|
|
const cdnURL = config.app.cdnURL
|
|
})
|
|
```
|
|
|
|
:read-more{to="/docs/guide/going-further/runtime-config"}
|