[ aws . cognito-idp ]



Adds additional user attributes to the user pool schema.

See also: AWS API Documentation

See ‘aws help’ for descriptions of global parameters.


--user-pool-id <value>
--custom-attributes <value>
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]
[--cli-auto-prompt <value>]


--user-pool-id (string)

The user pool ID for the user pool where you want to add custom attributes.

--custom-attributes (list)

An array of custom attributes, such as Mutable and Name.


Contains information about the schema attribute.

Name -> (string)

A schema attribute of the name type.

AttributeDataType -> (string)

The attribute data type.

DeveloperOnlyAttribute -> (boolean)


We recommend that you use 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 will not be able to modify this attribute using their access token. For example, DeveloperOnlyAttribute can be modified using the API but cannot be updated using the API.

Mutable -> (boolean)

Specifies whether the value of the attribute can be changed.

For any user pool attribute that’s mapped to an identity provider attribute, you must set this parameter to true . Amazon Cognito updates mapped attributes when users sign in to your application through an identity provider. 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 .

Required -> (boolean)

Specifies whether a user pool attribute is required. If the attribute is required and the user does not provide a value, registration or sign-in will fail.

NumberAttributeConstraints -> (structure)

Specifies the constraints for an attribute of the number type.

MinValue -> (string)

The minimum value of an attribute that is of the number data type.

MaxValue -> (string)

The maximum value of an attribute that is of the number data type.

StringAttributeConstraints -> (structure)

Specifies the constraints for an attribute of the string type.

MinLength -> (string)

The minimum length.

MaxLength -> (string)

The maximum length.

Shorthand Syntax:

Name=string,AttributeDataType=string,DeveloperOnlyAttribute=boolean,Mutable=boolean,Required=boolean,NumberAttributeConstraints={MinValue=string,MaxValue=string},StringAttributeConstraints={MinLength=string,MaxLength=string} ...

JSON Syntax:

    "Name": "string",
    "AttributeDataType": "String"|"Number"|"DateTime"|"Boolean",
    "DeveloperOnlyAttribute": true|false,
    "Mutable": true|false,
    "Required": true|false,
    "NumberAttributeConstraints": {
      "MinValue": "string",
      "MaxValue": "string"
    "StringAttributeConstraints": {
      "MinLength": "string",
      "MaxLength": "string"

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

--cli-auto-prompt (boolean) Automatically prompt for CLI input parameters.

See ‘aws help’ for descriptions of global parameters.


To add a custom attribute

This example adds a custom attribute CustomAttr1 to a user pool. It is a String type, and requires a minimum of 1 character and a maximum of 15. It is not required.


aws cognito-idp add-custom-attributes --user-pool-id us-west-2_aaaaaaaaa --custom-attributes Name="CustomAttr1",AttributeDataType="String",DeveloperOnlyAttribute=false,Required=false,StringAttributeConstraints="{MinLength=1,MaxLength=15}"