# UserDetails
<a name="API_UserDetails"></a>

A structure that contains information about the user session that this batch of events was collected from.

## Contents
<a name="API_UserDetails_Contents"></a>

 ** sessionId **   <a name="cloudwatchrum-Type-UserDetails-sessionId"></a>
The session ID that the performance events are from.  
Type: String  
Length Constraints: Fixed length of 36.  
Pattern: `[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}`   
Required: No

 ** userId **   <a name="cloudwatchrum-Type-UserDetails-userId"></a>
The ID of the user for this user session. This ID is generated by RUM and does not include any personally identifiable information about the user.  
Type: String  
Length Constraints: Fixed length of 36.  
Pattern: `[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}`   
Required: No

## See Also
<a name="API_UserDetails_SeeAlso"></a>

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/rum-2018-05-10/UserDetails) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/rum-2018-05-10/UserDetails) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/rum-2018-05-10/UserDetails)