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id: useIsMutating
title: useIsMutating
---
`useIsMutating` is an optional hook that returns the `number` of mutations that your application is fetching (useful for app-wide loading indicators).
```tsx
import { useIsMutating } from '@tanstack/react-query'
// How many mutations are fetching?
const isMutating = useIsMutating()
// How many mutations matching the posts prefix are fetching?
const isMutatingPosts = useIsMutating({ mutationKey: ['posts'] })
```
**Options**
- `filters?: MutationFilters`: [Mutation Filters](../../guides/filters.md#mutation-filters)
- `queryClient?: QueryClient`,
- Use this to use a custom QueryClient. Otherwise, the one from the nearest context will be used.
**Returns**
- `isMutating: number`
- Will be the `number` of the mutations that your application is currently fetching.
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