# UserOperation.toPacked

Transforms a User Operation into "packed" format.

## Imports

:::code-group
```ts [Named]
import { UserOperation } from 'ox/erc4337'
```

```ts [Entrypoint]
import * as UserOperation from 'ox/erc4337/UserOperation'
```
:::

## Examples

```ts twoslash
import { Value } from 'ox'
import { UserOperation } from 'ox/erc4337'

const packed = UserOperation.toPacked({
  callData: '0xdeadbeef',
  callGasLimit: 300_000n,
  maxFeePerGas: Value.fromGwei('20'),
  maxPriorityFeePerGas: Value.fromGwei('2'),
  nonce: 69n,
  preVerificationGas: 100_000n,
  sender: '0x9f1fdab6458c5fc642fa0f4c5af7473c46837357',
  signature: '0x...',
  verificationGasLimit: 100_000n
})
```

## Definition

```ts
function toPacked(
  userOperation: UserOperation<'0.7' | '0.8' | '0.9', true>,
  options?: toPacked.Options,
): Packed
```

**Source:** [src/erc4337/UserOperation.ts](https://github.com/wevm/ox/blob/main/src/erc4337/UserOperation.ts#L1098)

## Parameters

### userOperation

* **Type:** `UserOperation<'0.7' | '0.8' | '0.9', true>`

The user operation to transform.

#### userOperation.callData

* **Type:** `0x${string}`

The data to pass to the `sender` during the main execution call.

#### userOperation.callGasLimit

* **Type:** `bigintType`

The amount of gas to allocate the main execution call

#### userOperation.initCode

* **Type:** `0x${string}`
* **Optional**

Account init code. Only for new accounts.

#### userOperation.maxFeePerGas

* **Type:** `bigintType`

Maximum fee per gas.

#### userOperation.maxPriorityFeePerGas

* **Type:** `bigintType`

Maximum priority fee per gas.

#### userOperation.nonce

* **Type:** `bigintType`

Anti-replay parameter.

#### userOperation.paymasterAndData

* **Type:** `0x${string}`
* **Optional**

Paymaster address with calldata.

#### userOperation.preVerificationGas

* **Type:** `bigintType`

Extra gas to pay the Bundler.

#### userOperation.sender

* **Type:** `abitype_Address`

The account making the operation.

#### userOperation.signature

* **Type:** `0x${string}`

#### userOperation.verificationGasLimit

* **Type:** `bigintType`

The amount of gas to allocate for the verification step.

### options

* **Type:** `toPacked.Options`
* **Optional**

#### options.forHash

* **Type:** `boolean`
* **Optional**

Omits the paymaster signature while retaining its marker.

## Return Type

The packed user operation.

[`Packed`](/ercs/erc4337/UserOperation/types#useroperationpacked)