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66 lines
1.5 KiB
Markdown
66 lines
1.5 KiB
Markdown
# `abortNavigation`
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`abortNavigation` is a helper function that prevents navigation from taking place and throws an error if one is set as a parameter.
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::alert{type="warning"}
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`abortNavigation` is only usable inside a [route middleware handler](/guide/directory-structure/middleware).
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::
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## Type
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```ts
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abortNavigation(err?: Error | string): false
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```
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## Parameters
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### `err`
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- **Type**: [`Error`](https://developer.mozilla.org/pl/docs/Web/JavaScript/Reference/Global_Objects/Error) | `string`
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Optional error to be thrown by `abortNavigation`.
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## Examples
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The example below shows how you can use `abortNavigation` in a route middleware to prevent unauthorized route access:
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```ts [middleware/auth.ts]
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export default defineNuxtRouteMiddleware((to, from) => {
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const user = useState('user')
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if (!user.value.isAuthorized) {
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return abortNavigation()
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}
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return navigateTo('/edit-post')
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})
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```
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### `err` as a String
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You can pass the error as a string:
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```ts [middleware/auth.ts]
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export default defineNuxtRouteMiddleware((to, from) => {
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const auth = useState('auth')
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if (!user.value.isAuthorized) {
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abortNavigation('Insufficient permissions.')
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}
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})
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```
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### `err` as an Error Object
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You can pass the error as an [`Error`](https://developer.mozilla.org/pl/docs/Web/JavaScript/Reference/Global_Objects/Error) object, e.g. caught by the `catch`-block:
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```ts [middleware/auth.ts]
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export default defineNuxtRouteMiddleware((to, from) => {
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try {
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/* code that might throw an error */
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} catch (err) {
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abortNavigation(err)
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}
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})
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```
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