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[ aws . cognito-idp ]



Adds additional user attributes to the user pool schema.


Amazon Cognito evaluates Identity and Access Management (IAM) policies in requests for this API operation. For this operation, you must use IAM credentials to authorize requests, and you must grant yourself the corresponding IAM permission in a policy.

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See also: AWS API Documentation


--user-pool-id <value>
--custom-attributes <value>
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]
[--endpoint-url <value>]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <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.


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 .

Developer-only attributes are a legacy feature of user pools, 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.

Name -> (string)

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..

AttributeDataType -> (string)

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" .

DeveloperOnlyAttribute -> (boolean)


You should 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 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.

Mutable -> (boolean)

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 .

Required -> (boolean)

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.

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 length of a number attribute value. Must be a number less than or equal to 2^1023 , represented as a string with a length of 131072 characters or fewer.

StringAttributeConstraints -> (structure)

Specifies the constraints for an attribute of the string type.

MinLength -> (string)

The minimum length.

MaxLength -> (string)

The maximum length of a string attribute value. Must be a number less than or equal to 2^1023 , represented as a string with a length of 131072 characters or fewer.

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 (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI 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.

--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. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command's default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination.

--output (string)

The formatting style for command output.

  • json
  • text
  • table

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.



To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal's quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

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}"