[Home](./index.md) > [@firebase/storage](./storage.md) > [UploadTask](./storage.uploadtask.md) > [catch](./storage.uploadtask.catch.md) ## UploadTask.catch() method Equivalent to calling `then(null, onRejected)`. Signature: ```typescript catch(onRejected: (error: FirebaseStorageError) => unknown): Promise; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | onRejected | (error: [FirebaseStorageError](./storage.firebasestorageerror.md)) => unknown | | Returns: Promise<unknown>