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24 lines
1.3 KiB
Plaintext
24 lines
1.3 KiB
Plaintext
---
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title: '`NextRouter` was not mounted'
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---
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## Why This Error Occurred
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A component used `useRouter` outside a Next.js application, or was rendered outside a Next.js application. This can happen when doing unit testing on components that use the `useRouter` hook as they are not configured with Next.js' contexts.
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This can also happen when you try to use the `useRouter` hook from `next/router` inside the `app` directory, as the App Router's `useRouter` from `next/navigation` has different behavior to the `useRouter` hook in `pages`.
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## Possible Ways to Fix It
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If used in a test, mock out the router by mocking the `next/router`'s `useRouter()` hook.
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If used in the `app` directory, migrate to the new hooks imported from `next/navigation`.
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If used in the `pages` directory, try to update the export to [`next/compat/router`](/docs/pages/api-reference/functions/use-router#the-nextcompatrouter-export). This is the same `useRouter` hook but does not throw this error, intended to be used while migrating from `pages` to `app`.
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## Useful Links
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- [next-router-mock](https://www.npmjs.com/package/next-router-mock)
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- [App Router Migration](/docs/app/guides/migrating/app-router-migration#step-5-migrating-routing-hooks)
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- [useRouter](/docs/app/api-reference/functions/use-router)
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