[Home](./index.md) > [@workgrid/client](./client.md) > [Client](./client.client.md) > [customMutate](./client.client.custommutate.md) ## Client.customMutate() method > This API is provided as a preview for developers and may change based on feedback that we receive. Do not use this API in a production environment. > Invoke a custom mutation (should be used sparingly and never in production) Signature: ```typescript customMutate(mutationKey: CustomMutationKey, variables?: TVariables, options?: MutationOptions): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | mutationKey | CustomMutationKey | A unique cache key | | variables | TVariables | The appropriate variables | | options | MutationOptions<TData, TError, TVariables, TContext> | Any additional mutation options | Returns: Promise<TData> The mutation result