# ExecutionStartedEventDetails
<a name="API_ExecutionStartedEventDetails"></a>

Contains details about the start of the execution.

## Contents
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 ** input **   <a name="StepFunctions-Type-ExecutionStartedEventDetails-input"></a>
The JSON data input to the execution. Length constraints apply to the payload size, and are expressed as bytes in UTF-8 encoding.  
Type: String  
Length Constraints: Maximum length of 262144.  
Required: No

 ** inputDetails **   <a name="StepFunctions-Type-ExecutionStartedEventDetails-inputDetails"></a>
Contains details about the input for an execution history event.  
Type: [HistoryEventExecutionDataDetails](API_HistoryEventExecutionDataDetails.md) object  
Required: No

 ** roleArn **   <a name="StepFunctions-Type-ExecutionStartedEventDetails-roleArn"></a>
The Amazon Resource Name (ARN) of the IAM role used for executing AWS Lambda tasks.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: No

 ** stateMachineAliasArn **   <a name="StepFunctions-Type-ExecutionStartedEventDetails-stateMachineAliasArn"></a>
The Amazon Resource Name (ARN) that identifies a state machine alias used for starting the state machine execution.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: No

 ** stateMachineVersionArn **   <a name="StepFunctions-Type-ExecutionStartedEventDetails-stateMachineVersionArn"></a>
The Amazon Resource Name (ARN) that identifies a state machine version used for starting the state machine execution.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/states-2016-11-23/ExecutionStartedEventDetails) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/states-2016-11-23/ExecutionStartedEventDetails) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/states-2016-11-23/ExecutionStartedEventDetails)