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

# AWS::Cognito::UserPool SchemaAttribute
<a name="aws-properties-cognito-userpool-schemaattribute"></a>

A list of the user attributes and their properties in your user pool. The attribute schema contains standard attributes, custom attributes with a `custom:` prefix, and developer attributes with a `dev:` prefix. For more information, see [User pool attributes](https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-settings-attributes.html).

Developer-only `dev:` attributes are a legacy feature of user pools, and are read-only to all app clients. You can create and update developer-only attributes only with IAM-authenticated API operations. Use app client read/write permissions instead.

## Syntax
<a name="aws-properties-cognito-userpool-schemaattribute-syntax"></a>

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

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

```
{
  "[AttributeDataType](#cfn-cognito-userpool-schemaattribute-attributedatatype)" : String,
  "[DeveloperOnlyAttribute](#cfn-cognito-userpool-schemaattribute-developeronlyattribute)" : Boolean,
  "[Mutable](#cfn-cognito-userpool-schemaattribute-mutable)" : Boolean,
  "[Name](#cfn-cognito-userpool-schemaattribute-name)" : String,
  "[NumberAttributeConstraints](#cfn-cognito-userpool-schemaattribute-numberattributeconstraints)" : NumberAttributeConstraints,
  "[Required](#cfn-cognito-userpool-schemaattribute-required)" : Boolean,
  "[StringAttributeConstraints](#cfn-cognito-userpool-schemaattribute-stringattributeconstraints)" : StringAttributeConstraints
}
```

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

```
  [AttributeDataType](#cfn-cognito-userpool-schemaattribute-attributedatatype): String
  [DeveloperOnlyAttribute](#cfn-cognito-userpool-schemaattribute-developeronlyattribute): Boolean
  [Mutable](#cfn-cognito-userpool-schemaattribute-mutable): Boolean
  [Name](#cfn-cognito-userpool-schemaattribute-name): String
  [NumberAttributeConstraints](#cfn-cognito-userpool-schemaattribute-numberattributeconstraints): 
    NumberAttributeConstraints
  [Required](#cfn-cognito-userpool-schemaattribute-required): Boolean
  [StringAttributeConstraints](#cfn-cognito-userpool-schemaattribute-stringattributeconstraints): 
    StringAttributeConstraints
```

## Properties
<a name="aws-properties-cognito-userpool-schemaattribute-properties"></a>

`AttributeDataType`  <a name="cfn-cognito-userpool-schemaattribute-attributedatatype"></a>
The data format of the values for your attribute. When you choose an `AttributeDataType`, Amazon Cognito validates the input against the data type. A custom attribute value in your user's ID token is always a string, for example `"custom:isMember" : "true"` or `"custom:YearsAsMember" : "12"`.   
*Required*: No  
*Type*: String  
*Allowed values*: `String | Number | DateTime | Boolean`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`DeveloperOnlyAttribute`  <a name="cfn-cognito-userpool-schemaattribute-developeronlyattribute"></a>
You should use [WriteAttributes](https://docs.aws.amazon.com/cognito-user-identity-pools/latest/APIReference/API_UserPoolClientType.html#CognitoUserPools-Type-UserPoolClientType-WriteAttributes) in the user pool client to control how attributes can be mutated for new use cases instead of using `DeveloperOnlyAttribute`.
Specifies whether the attribute type is developer only. This attribute can only be modified by an administrator. Users won't be able to modify this attribute using their access token. For example, `DeveloperOnlyAttribute` can be modified using AdminUpdateUserAttributes but can't be updated using UpdateUserAttributes.  
*Required*: No  
*Type*: Boolean  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Mutable`  <a name="cfn-cognito-userpool-schemaattribute-mutable"></a>
Specifies whether the value of the attribute can be changed.  
Any user pool attribute whose value you map from an IdP attribute must be mutable, with a parameter value of `true`. Amazon Cognito updates mapped attributes when users sign in to your application through an IdP. If an attribute is immutable, Amazon Cognito throws an error when it attempts to update the attribute. For more information, see [Specifying Identity Provider Attribute Mappings for Your User Pool](https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-specifying-attribute-mapping.html).  
*Required*: No  
*Type*: Boolean  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Name`  <a name="cfn-cognito-userpool-schemaattribute-name"></a>
The name of your user pool attribute. When you create or update a user pool, adding a schema attribute creates a custom or developer-only attribute. When you add an attribute with a `Name` value of `MyAttribute`, Amazon Cognito creates the custom attribute `custom:MyAttribute`. When `DeveloperOnlyAttribute` is `true`, Amazon Cognito creates your attribute as `dev:MyAttribute`. In an operation that describes a user pool, Amazon Cognito returns this value as `value` for standard attributes, `custom:value` for custom attributes, and `dev:value` for developer-only attributes..  
*Required*: No  
*Type*: String  
*Pattern*: `[\p{L}\p{M}\p{S}\p{N}\p{P}]+`  
*Minimum*: `1`  
*Maximum*: `20`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`NumberAttributeConstraints`  <a name="cfn-cognito-userpool-schemaattribute-numberattributeconstraints"></a>
Specifies the constraints for an attribute of the number type.  
*Required*: No  
*Type*: [NumberAttributeConstraints](aws-properties-cognito-userpool-numberattributeconstraints.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Required`  <a name="cfn-cognito-userpool-schemaattribute-required"></a>
Specifies whether a user pool attribute is required. If the attribute is required and the user doesn't provide a value, registration or sign-in will fail.  
*Required*: No  
*Type*: Boolean  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`StringAttributeConstraints`  <a name="cfn-cognito-userpool-schemaattribute-stringattributeconstraints"></a>
Specifies the constraints for an attribute of the string type.  
*Required*: No  
*Type*: [StringAttributeConstraints](aws-properties-cognito-userpool-stringattributeconstraints.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)