# ModifyUser
<a name="API_ModifyUser"></a>

Changes user password(s) and/or access string.

## Request Parameters
<a name="API_ModifyUser_RequestParameters"></a>

 For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

 ** UserId **   
The ID of the user.  
Type: String  
Length Constraints: Minimum length of 1.  
Pattern: `[a-zA-Z][a-zA-Z0-9\-]*`   
Required: Yes

 ** AccessString **   
Access permissions string used for this user.  
Type: String  
Pattern: `.*\S.*`   
Required: No

 ** AppendAccessString **   
Adds additional user permissions to the access string.  
Type: String  
Pattern: `.*\S.*`   
Required: No

 ** AuthenticationMode **   
Specifies how to authenticate the user.  
Type: [AuthenticationMode](API_AuthenticationMode.md) object  
Required: No

 ** Engine **   
Modifies the engine listed for a user. The options are valkey or redis.  
Type: String  
Pattern: `[a-zA-Z]*`   
Required: No

 ** NoPasswordRequired **   
Indicates no password is required for the user.  
Type: Boolean  
Required: No

 **Passwords.member.N**   
The passwords belonging to the user. You are allowed up to two.  
Type: Array of strings  
Array Members: Minimum number of 1 item.  
Required: No

## Response Elements
<a name="API_ModifyUser_ResponseElements"></a>

The following elements are returned by the service.

 ** AccessString **   
Access permissions string used for this user.  
Type: String

 ** ARN **   
The Amazon Resource Name (ARN) of the user.  
Type: String

 ** Authentication **   
Denotes whether the user requires a password to authenticate.  
Type: [Authentication](API_Authentication.md) object

 ** Engine **   
The options are valkey or redis.  
Type: String  
Pattern: `[a-zA-Z]*` 

 ** MinimumEngineVersion **   
The minimum engine version required, which is Redis OSS 6.0  
Type: String

 ** Status **   
Indicates the user status. Can be "active", "modifying" or "deleting".  
Type: String

 **UserGroupIds.member.N**   
Returns a list of the user group IDs the user belongs to.  
Type: Array of strings  
Length Constraints: Minimum length of 1.  
Pattern: `[a-zA-Z][a-zA-Z0-9\-]*` 

 ** UserId **   
The ID of the user.  
Type: String

 ** UserName **   
The username of the user.  
Type: String

## Errors
<a name="API_ModifyUser_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** InvalidParameterCombination **   
Two or more incompatible parameters were specified.    
 ** message **   
Two or more parameters that must not be used together were used together.
HTTP Status Code: 400

 ** InvalidParameterValue **   
The value for a parameter is invalid.    
 ** message **   
A parameter value is invalid.
HTTP Status Code: 400

 ** InvalidUserState **   
The user is not in active state.  
HTTP Status Code: 400

 ** ServiceLinkedRoleNotFoundFault **   
The specified service linked role (SLR) was not found.  
HTTP Status Code: 400

 ** UserNotFound **   
The user does not exist or could not be found.  
HTTP Status Code: 404

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

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/elasticache-2015-02-02/ModifyUser) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/elasticache-2015-02-02/ModifyUser)