This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::Cognito::UserPoolDomain CustomDomainConfigType
<a name="aws-properties-cognito-userpooldomain-customdomainconfigtype"></a>

The configuration for a hosted UI custom domain.

## Syntax
<a name="aws-properties-cognito-userpooldomain-customdomainconfigtype-syntax"></a>

To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-cognito-userpooldomain-customdomainconfigtype-syntax.json"></a>

```
{
  "[CertificateArn](#cfn-cognito-userpooldomain-customdomainconfigtype-certificatearn)" : String
}
```

### YAML
<a name="aws-properties-cognito-userpooldomain-customdomainconfigtype-syntax.yaml"></a>

```
  [CertificateArn](#cfn-cognito-userpooldomain-customdomainconfigtype-certificatearn): String
```

## Properties
<a name="aws-properties-cognito-userpooldomain-customdomainconfigtype-properties"></a>

`CertificateArn`  <a name="cfn-cognito-userpooldomain-customdomainconfigtype-certificatearn"></a>
The Amazon Resource Name (ARN) of an Amazon Certificate Manager SSL certificate. You use this certificate for the subdomain of your custom domain.  
*Required*: No  
*Type*: String  
*Pattern*: `arn:[\w+=/,.@-]+:[\w+=/,.@-]+:([\w+=/,.@-]*)?:[0-9]+:[\w+=/,.@-]+(:[\w+=/,.@-]+)?(:[\w+=/,.@-]+)?`  
*Minimum*: `20`  
*Maximum*: `2048`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)