This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::IoT::Command CommandPreprocessor
<a name="aws-properties-iot-command-commandpreprocessor"></a>

<a name="aws-properties-iot-command-commandpreprocessor-description"></a>The `CommandPreprocessor` property type specifies Property description not available. for an [AWS::IoT::Command](aws-resource-iot-command.md).

## Syntax
<a name="aws-properties-iot-command-commandpreprocessor-syntax"></a>

To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-iot-command-commandpreprocessor-syntax.json"></a>

```
{
  "[AwsJsonSubstitution](#cfn-iot-command-commandpreprocessor-awsjsonsubstitution)" : AwsJsonSubstitutionCommandPreprocessorConfig
}
```

### YAML
<a name="aws-properties-iot-command-commandpreprocessor-syntax.yaml"></a>

```
  [AwsJsonSubstitution](#cfn-iot-command-commandpreprocessor-awsjsonsubstitution): 
    AwsJsonSubstitutionCommandPreprocessorConfig
```

## Properties
<a name="aws-properties-iot-command-commandpreprocessor-properties"></a>

`AwsJsonSubstitution`  <a name="cfn-iot-command-commandpreprocessor-awsjsonsubstitution"></a>
Property description not available.  
*Required*: No  
*Type*: [AwsJsonSubstitutionCommandPreprocessorConfig](aws-properties-iot-command-awsjsonsubstitutioncommandpreprocessorconfig.md)  
*Update requires*: [Replacement](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)