# UpdateUser
<a name="API_UpdateUser"></a>

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

## Request Syntax
<a name="API_UpdateUser_RequestSyntax"></a>

```
{
   "AccessString": "string",
   "AuthenticationMode": { 
      "Passwords": [ "string" ],
      "Type": "string"
   },
   "UserName": "string"
}
```

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

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

The request accepts the following data in JSON format.

 ** [AccessString](#API_UpdateUser_RequestSyntax) **   <a name="MemoryDB-UpdateUser-request-AccessString"></a>
Access permissions string used for this user.  
Type: String  
Pattern: `.*\S.*`   
Required: No

 ** [AuthenticationMode](#API_UpdateUser_RequestSyntax) **   <a name="MemoryDB-UpdateUser-request-AuthenticationMode"></a>
Denotes the user's authentication properties, such as whether it requires a password to authenticate.  
Type: [AuthenticationMode](API_AuthenticationMode.md) object  
Required: No

 ** [UserName](#API_UpdateUser_RequestSyntax) **   <a name="MemoryDB-UpdateUser-request-UserName"></a>
The name of the user  
Type: String  
Length Constraints: Minimum length of 1.  
Pattern: `[a-zA-Z][a-zA-Z0-9\-]*`   
Required: Yes

## Response Syntax
<a name="API_UpdateUser_ResponseSyntax"></a>

```
{
   "User": { 
      "AccessString": "string",
      "ACLNames": [ "string" ],
      "ARN": "string",
      "Authentication": { 
         "PasswordCount": number,
         "Type": "string"
      },
      "MinimumEngineVersion": "string",
      "Name": "string",
      "Status": "string"
   }
}
```

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

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

 ** [User](#API_UpdateUser_ResponseSyntax) **   <a name="MemoryDB-UpdateUser-response-User"></a>
The updated user  
Type: [User](API_User.md) object

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

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

 ** InvalidParameterCombinationException **   
  
HTTP Status Code: 400

 ** InvalidParameterValueException **   
  
HTTP Status Code: 400

 ** InvalidUserStateFault **   
  
HTTP Status Code: 400

 ** UserNotFoundFault **   
  
HTTP Status Code: 400

## See Also
<a name="API_UpdateUser_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/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/memorydb-2021-01-01/UpdateUser) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/memorydb-2021-01-01/UpdateUser)