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[Home](./index.md) > [@firebase/storage](./storage.md) > [UploadTask](./storage.uploadtask.md) > [cancel](./storage.uploadtask.cancel.md)
## UploadTask.cancel() method
Cancels a running task. Has no effect on a complete or failed task.
<b>Signature:</b>
```typescript
cancel(): boolean;
```
<b>Returns:</b>
boolean
True if the cancel had an effect.