# CustomDomainConfigType
<a name="API_CustomDomainConfigType"></a>

The configuration for a hosted UI custom domain.

This data type is a request parameter of [CreateUserPoolDomain](API_CreateUserPoolDomain.md) and [UpdateUserPoolDomain](API_UpdateUserPoolDomain.md).

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

 ** CertificateArn **   <a name="CognitoUserPools-Type-CustomDomainConfigType-CertificateArn"></a>
The Amazon Resource Name (ARN) of an AWS Certificate Manager SSL certificate. You use this certificate for the subdomain of your custom domain.  
Type: String  
Length Constraints: Minimum length of 20. Maximum length of 2048.  
Pattern: `arn:[\w+=/,.@-]+:[\w+=/,.@-]+:([\w+=/,.@-]*)?:[0-9]+:[\w+=/,.@-]+(:[\w+=/,.@-]+)?(:[\w+=/,.@-]+)?`   
Required: Yes

## See Also
<a name="API_CustomDomainConfigType_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/cognito-idp-2016-04-18/CustomDomainConfigType) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cognito-idp-2016-04-18/CustomDomainConfigType) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cognito-idp-2016-04-18/CustomDomainConfigType)