> ## Documentation Index
> Fetch the complete documentation index at: https://docs.rhinestone.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# signUserOperation

> Sign a prepared user operation.

Method on an account instance returned by [`createAccount`](/sdk-reference/rhinestone-sdk/create-account).

## Usage

```ts theme={null}
const userOperation = await account.signUserOperation(preparedUserOperation)
```

## Parameters

<ParamField path="preparedUserOperation" type="PreparedUserOperationData" required>
  Prepared user operation data
</ParamField>

## Returns

<ResponseField name="userOperation" type="SignedUserOperationData">
  The signed user operation data
</ResponseField>

## See also

* [prepareUserOperation](/sdk-reference/account/user-operations/prepare-user-operation) to prepare the user operation data for signing
* [submitUserOperation](/sdk-reference/account/user-operations/submit-user-operation) to submit the signed user operation