Nuxt/docs/content/3.api/3.utils/abort-navigation.md

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