| 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. | |