---
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id: useIsMutating
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title: useIsMutating
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---
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`useIsMutating` is an optional hook that returns the `number` of mutations that your application is fetching (useful for app-wide loading indicators).
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```tsx
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import { useIsMutating } from '@tanstack/react-query'
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// How many mutations are fetching?
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const isMutating = useIsMutating()
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// How many mutations matching the posts prefix are fetching?
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const isMutatingPosts = useIsMutating({ mutationKey: ['posts'] })
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```
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**Options**
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- `filters?: MutationFilters`: [Mutation Filters](../guides/filters.md#mutation-filters)
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docs: remove unnecessary trailing comma (#9594)
Co-authored-by: Jonghyeon Ko <manudeli.ko@gmail.com>
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- `queryClient?: QueryClient`
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- Use this to use a custom QueryClient. Otherwise, the one from the nearest context will be used.
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**Returns**
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- `isMutating: number`
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- Will be the `number` of the mutations that your application is currently fetching.
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