terraform-aws-cognito-user-pool

Terraform module to create Amazon Cognito User Pools, configure its attributes and resources such as app clients, domain, resource servers. Amazon Cognito User Pools provide a secure user directory that scales to hundreds of millions of users. As a fully managed service, User Pools are easy to set up without any worries about standing up server infrastructure.

Usage

You can use this module to create a Cognito User Pool using the default values or use the detailed definition to set every aspect of the Cognito User Pool

Check the examples where you can see the simple example using the default values, the simple_extended version which adds app clients, domain, resource servers resources, the complete version with a detailed example, or the with_branding example that demonstrates managed login branding capabilities.

Example (simple)

This simple example creates a AWS Cognito User Pool with the default values:

module "aws_cognito_user_pool_simple" {
  source  = "lgallard/cognito-user-pool/aws"

  user_pool_name = "mypool"

  # Recommended: Enable schema ignore changes for new deployments
  # This prevents perpetual diffs if you plan to use custom schemas
  ignore_schema_changes = true

  tags = {
    Owner       = "infra"
    Environment = "production"
    Terraform   = true
  }
}

Example (conditional creation)

If you need to create Cognito User Pool resources conditionally in ealierform versions such as 0.11, 0,12 and 0.13 you can set the input variable enabled to false:

# This Cognito User Pool will not be created
module "aws_cognito_user_pool_conditional_creation" {
  source  = "lgallard/cognito-user-pool/aws"

  user_pool_name = "conditional_user_pool"

  enabled = false

  # Recommended: Enable schema ignore changes for new deployments
  # This prevents perpetual diffs if you plan to use custom schemas
  ignore_schema_changes = true

  tags = {
    Owner       = "infra"
    Environment = "production"
    Terraform   = true
  }
}

For Terraform 0.14 and later you can use count inside module blocks, or use the input variable enabled as described above.

Example (complete)

This more complete example creates a AWS Cognito User Pool using a detailed configuration. Please check the example folder to get the example with all options:

module "aws_cognito_user_pool_complete" {
  source  = "lgallard/cognito-user-pool/aws"

  user_pool_name           = "mypool"
  alias_attributes         = ["email", "phone_number"]
  auto_verified_attributes = ["email"]
  user_pool_tier           = "ESSENTIALS" # Valid values: LITE, ESSENTIALS, PLUS. Default is ESSENTIALS

  deletion_protection = "ACTIVE"

  # IMPORTANT: Enable schema ignore changes to prevent perpetual diffs with custom schemas
  # This is ESSENTIAL for new deployments using custom schemas to avoid AWS API errors
  ignore_schema_changes = true

  admin_create_user_config = {
    email_subject = "Here, your verification code baby"
  }

  email_configuration = {
    email_sending_account  = "DEVELOPER"
    reply_to_email_address = "[email protected]"
    source_arn             = "arn:aws:ses:us-east-1:888888888888:identity/example.com"
    from_email_address     = "[email protected]"
    configuration_set      = "my-configuration-set"
  }

  password_policy = {
    minimum_length    = 10
    require_lowercase = false
    require_numbers   = true
    require_symbols   = true
    require_uppercase = true
  }

  schemas = [
    {
      attribute_data_type      = "Boolean"
      developer_only_attribute = false
      mutable                  = true
      name                     = "available"
      required                 = false
    },
    {
      attribute_data_type      = "Boolean"
      developer_only_attribute = true
      mutable                  = true
      name                     = "registered"
      required                 = false
    }
  ]

  string_schemas = [
    {
      attribute_data_type      = "String"
      developer_only_attribute = false
      mutable                  = false
      name                     = "email"
      required                 = true

      string_attribute_constraints = {
        min_length = 7
        max_length = 15
      }
    }
  ]

  recovery_mechanisms = [
     {
      name     = "verified_email"
      priority = 1
    },
    {
      name     = "verified_phone_number"
      priority = 2
    }
  ]

  sign_in_policy = {
    allowed_first_auth_factors = ["PASSWORD", "EMAIL_OTP", "SMS_OTP"]
  }

  tags = {
    Owner       = "infra"
    Environment = "production"
    Terraform   = true
  }
}

Schema Management

⚠️ Important: Schema Perpetual Diff Fix Available

RECOMMENDATION FOR NEW DEPLOYMENTS: Set ignore_schema_changes = true to avoid schema-related issues from the start.

If you're experiencing perpetual diffs with custom schemas, this module provides an opt-in fix. The fix is disabled by default to ensure backward compatibility with existing deployments, but new deployments should enable it proactively.

The Schema Perpetual Diff Problem

AWS Cognito User Pool schemas cannot be modified or removed after creation. However, due to how the AWS API returns schema information (with different ordering and additional empty constraint blocks), Terraform shows perpetual diffs and attempts to recreate schemas on every plan:

- schema {
  - attribute_data_type      = "String" -> null
  - developer_only_attribute = false -> null
  - mutable                  = true -> null
  - name                     = "roles" -> null
  - required                 = false -> null
  - string_attribute_constraints {}
}
+ schema {
  + attribute_data_type      = "String"
  + developer_only_attribute = false
  + mutable                  = true
  + name                     = "roles"
  + required                 = false
}

This results in AWS API errors since schema attributes are immutable after creation.

✅ Solution: Enable Schema Change Ignore

To fix this issue, set ignore_schema_changes = true:

module "aws_cognito_user_pool" {
  source = "lgallard/cognito-user-pool/aws"

  user_pool_name = "mypool"

  # Enable this to prevent perpetual diffs with custom schemas
  ignore_schema_changes = true

  schemas = [
    {
      attribute_data_type      = "String"
      developer_only_attribute = false
      mutable                  = true
      name                     = "roles"
      required                 = false
    }
  ]

  tags = {
    Owner       = "infra"
    Environment = "production"
    Terraform   = true
  }
}

🔧 Technical Implementation Details

Why Terraform Doesn't Support Conditional ignore_changes:

Terraform's lifecycle blocks require static values because they affect dependency graph construction. According to the official documentation:

"The lifecycle settings all affect how Terraform constructs and traverses the dependency graph. As a result, only literal values can be used because the processing happens too early for arbitrary expression evaluation."

This means expressions like ignore_changes = var.ignore_schema_changes ? [schema] : [] are not supported.

Dual-Resource Approach:

To work around this limitation, the module uses a dual-resource approach:

One aws_cognito_user_pool resource without lifecycle ignore (default behavior)
One aws_cognito_user_pool resource with lifecycle { ignore_changes = [schema] }
Conditional creation based on the ignore_schema_changes variable
All other resources reference the appropriate user pool via a local value

🔄 Migration for Existing Deployments

If you have an existing deployment and want to enable the fix:

For new deployments with custom schemas: Always set ignore_schema_changes = true

For existing deployments experiencing the issue:

# Enable the fix in your configuration
ignore_schema_changes = true

Then run:

# Plan to see the changes
terraform plan

# Apply - this will create the new resource variant
terraform apply

# Import existing state to the new resource
terraform state mv aws_cognito_user_pool.pool[0] aws_cognito_user_pool.pool_with_schema_ignore[0]

📝 Adding New Schema Attributes

Important: Once a schema attribute is created in Cognito, it cannot be modified or removed. Plan your schema carefully.

If you need to add new schema attributes after enabling ignore_schema_changes = true:

Temporary approach: Set ignore_schema_changes = false, add attributes, apply, then set back to true
Separate resources: Use the aws_cognito_user_pool_schema resource for new attributes (AWS provider v5+)
Recreation: Destroy and recreate the user pool (⚠️ destroys all user data)

💡 Best Practices

🎯 NEW DEPLOYMENTS: Always use ignore_schema_changes = true to prevent schema perpetual diffs from the start
Plan your schema carefully: Schema attributes are immutable after creation
Use separate schema resources: For maximum flexibility, consider using aws_cognito_user_pool_schema resources
Test thoroughly: Always run terraform plan to verify expected behavior

Managed Login Branding

This module supports AWS Cognito Managed Login Branding, which allows you to customize the hosted UI with your own logos, background images, colors, and styling. This feature requires the awscc provider and is available as an optional enhancement.

🎨 Features

Custom Assets: Logos, backgrounds, favicons, and other visual elements
Multi-mode Support: Light, dark, and browser-adaptive themes
JSON Settings: Advanced styling with colors, typography, and layout
Client Association: Link branding to specific app clients
Asset Management: Support for PNG, JPG, SVG, ICO formats (max 2MB each)

📋 Requirements

To use managed login branding, you need:

AWSCC Provider: Add to your Terraform configuration
User Pool Domain: Required for hosted UI
App Client: Branding is associated with specific clients
Asset Files: Images for logos, backgrounds, etc.

🚀 Quick Start

terraform {
  required_providers {
    aws = {
      source  = "hashicorp/aws"
      version = ">= 5.95"
    }
    awscc = {
      source  = "hashicorp/awscc"
      version = ">= 1.0"
    }
  }
}

module "cognito_with_branding" {
  source = "lgallard/cognito-user-pool/aws"

  user_pool_name = "my-branded-pool"
  
  # Enable branding
  managed_login_branding_enabled = true
  
  # Branding configuration
  managed_login_branding = {
    "main-branding" = {
      client_id = "your-client-id"
      
      assets = [
        {
          bytes      = filebase64("./logo.png")
          category   = "FORM_LOGO"
          color_mode = "LIGHT"
          extension  = "png"
        }
      ]
      
      settings = jsonencode({
        "colorScheme" = {
          "light" = {
            "primary" = "#007bff"
          }
        }
      })
    }
  }
}

📁 Complete Example

See the with_branding example for a comprehensive implementation including:

Provider configuration
Multiple asset types (logos, backgrounds, favicon)
Light/dark mode support
Custom color schemes and typography
Complete setup instructions

🎯 Asset Categories

Category	Description	Recommended Size
`FORM_LOGO`	Logo on login form	200x60px
`PAGE_BACKGROUND`	Page background image	1920x1080px
`FAVICON_ICO`	Browser favicon	32x32px
`PAGE_HEADER_LOGO`	Header logo	200x60px
`PAGE_FOOTER_LOGO`	Footer logo	200x60px

⚠️ Important Notes

Provider Dependency: Branding requires the awscc provider in your root module
Regional Support: Available in most AWS regions where Cognito is supported
File Limits: Maximum 2MB per asset, Base64 encoding handled automatically
Immutable Association: Branding is linked to specific app clients
Cost Implications: Managed login branding may incur additional AWS charges

🔒 Security Considerations

Asset Scanning: Scan all image assets for malware before deployment
Content Validation: Ensure assets contain only expected image content
Source Control: Avoid committing large binary assets to version control
Access Control: Restrict access to asset files during build/deployment
Regular Updates: Keep branding assets updated and remove unused files

🔧 Troubleshooting

Provider Issues:

Error: Invalid provider configuration: Ensure awscc provider is configured in your root module
Error: No valid credential sources: Configure AWS credentials for both aws and awscc providers
Error: Region not supported: Verify managed login branding is available in your target region

Asset Problems:

Error: Asset file size exceeds limit: Reduce image file size to under 2MB
Error: Invalid file format: Use supported formats (PNG, JPG, JPEG, SVG, ICO)
Error: File not found: Verify asset file paths are correct and files exist

Resource Dependencies:

Error: Client ID not found: Ensure the specified client exists in the user pool
Error: User pool domain required: Create a user pool domain before enabling branding
Error: Circular dependency: Use the pattern in the example to avoid dependencies

Requirements

Name	Version
terraform	>= 1.3.0
aws	>= 5.95

Providers

Name	Version
aws	6.2.0

Modules

No modules.

Resources

Name	Type
aws_cognito_identity_provider.identity_provider	resource
aws_cognito_resource_server.resource	resource
aws_cognito_user_group.main	resource
aws_cognito_user_pool.pool	resource
aws_cognito_user_pool.pool_with_schema_ignore	resource
aws_cognito_user_pool_client.client	resource
aws_cognito_user_pool_domain.domain	resource
aws_cognito_user_pool_ui_customization.default_ui_customization	resource
aws_cognito_user_pool_ui_customization.ui_customization	resource

Inputs

Name	Description	Type	Default	Required
admin_create_user_config	The configuration for AdminCreateUser requests	`map(any)`	`{}`	no
admin_create_user_config_allow_admin_create_user_only	Set to True if only the administrator is allowed to create user profiles. Set to False if users can sign themselves up via an app	`bool`	`true`	no
admin_create_user_config_email_message	The message template for email messages. Must contain `{username}` and `{####}` placeholders, for username and temporary password, respectively	`string`	`"{username}, your verification code is` {####}`"`	no
admin_create_user_config_email_subject	The subject line for email messages	`string`	`"Your verification code"`	no
admin_create_user_config_sms_message	- The message template for SMS messages. Must contain `{username}` and `{####}` placeholders, for username and temporary password, respectively	`string`	`"Your username is {username} and temporary password is` {####}`"`	no
alias_attributes	Attributes supported as an alias for this user pool. Possible values: phone_number, email, or preferred_username. Conflicts with `username_attributes`	`list(string)`	`null`	no
auto_verified_attributes	The attributes to be auto-verified. Possible values: email, phone_number	`list(string)`	`[]`	no
client_access_token_validity	Time limit, between 5 minutes and 1 day, after which the access token is no longer valid and cannot be used. This value will be overridden if you have entered a value in `token_validity_units`.	`number`	`60`	no
client_allowed_oauth_flows	The name of the application client	`list(string)`	`[]`	no
client_allowed_oauth_flows_user_pool_client	Whether the client is allowed to follow the OAuth protocol when interacting with Cognito user pools	`bool`	`true`	no
client_allowed_oauth_scopes	List of allowed OAuth scopes (phone, email, openid, profile, and aws.cognito.signin.user.admin)	`list(string)`	`[]`	no
client_auth_session_validity	Amazon Cognito creates a session token for each API request in an authentication flow. AuthSessionValidity is the duration, in minutes, of that session token. Your user pool native user must respond to each authentication challenge before the session expires. Valid values between 3 and 15. Default value is 3.	`number`	`3`	no
client_callback_urls	List of allowed callback URLs for the identity providers	`list(string)`	`[]`	no
client_default_redirect_uri	The default redirect URI. Must be in the list of callback URLs	`string`	`""`	no
client_enable_token_revocation	Whether the client token can be revoked	`bool`	`true`	no
client_explicit_auth_flows	List of authentication flows (ADMIN_NO_SRP_AUTH, CUSTOM_AUTH_FLOW_ONLY, USER_PASSWORD_AUTH)	`list(string)`	`[]`	no
client_generate_secret	Should an application secret be generated	`bool`	`true`	no
client_id_token_validity	Time limit, between 5 minutes and 1 day, after which the ID token is no longer valid and cannot be used. Must be between 5 minutes and 1 day. Cannot be greater than refresh token expiration. This value will be overridden if you have entered a value in `token_validity_units`.	`number`	`60`	no
client_logout_urls	List of allowed logout URLs for the identity providers	`list(string)`	`[]`	no
client_name	The name of the application client	`string`	`null`	no
client_prevent_user_existence_errors	Choose which errors and responses are returned by Cognito APIs during authentication, account confirmation, and password recovery when the user does not exist in the user pool. When set to ENABLED and the user does not exist, authentication returns an error indicating either the username or password was incorrect, and account confirmation and password recovery return a response indicating a code was sent to a simulated destination. When set to LEGACY, those APIs will return a UserNotFoundException exception if the user does not exist in the user pool.	`string`	`null`	no
client_read_attributes	List of user pool attributes the application client can read from	`list(string)`	`[]`	no
client_refresh_token_validity	The time limit in days refresh tokens are valid for. Must be between 60 minutes and 3650 days. This value will be overridden if you have entered a value in `token_validity_units`	`number`	`30`	no
client_supported_identity_providers	List of provider names for the identity providers that are supported on this client	`list(string)`	`[]`	no
client_token_validity_units	Configuration block for units in which the validity times are represented in. Valid values for the following arguments are: `seconds`, `minutes`, `hours` or `days`.	`any`	{ "access_token": "minutes", "id_token": "minutes", "refresh_token": "days" }	no
client_write_attributes	List of user pool attributes the application client can write to	`list(string)`	`[]`	no
clients	A container with the clients definitions	`any`	`[]`	no
default_ui_customization_css	CSS file content for default UI customization	`string`	`null`	no
default_ui_customization_image_file	Image file path for default UI customization	`string`	`null`	no
deletion_protection	When active, DeletionProtection prevents accidental deletion of your user pool. Before you can delete a user pool that you have protected against deletion, you must deactivate this feature. Valid values are `ACTIVE` and `INACTIVE`.	`string`	`"INACTIVE"`	no
device_configuration	The configuration for the user pool's device tracking	`map(any)`	`{}`	no
device_configuration_challenge_required_on_new_device	Indicates whether a challenge is required on a new device. Only applicable to a new device	`bool`	`null`	no
device_configuration_device_only_remembered_on_user_prompt	If true, a device is only remembered on user prompt	`bool`	`null`	no
domain	Cognito User Pool domain	`string`	`null`	no
domain_certificate_arn	The ARN of an ISSUED ACM certificate in us-east-1 for a custom domain	`string`	`null`	no
domain_managed_login_version	The version number of managed login for your domain. 1 for hosted UI (classic), 2 for the newer managed login	`number`	`1`	no
email_configuration	The Email Configuration	`map(any)`	`{}`	no
email_configuration_configuration_set	The name of the configuration set	`string`	`null`	no
email_configuration_email_sending_account	Instruct Cognito to either use its built-in functional or Amazon SES to send out emails. Allowed values: `COGNITO_DEFAULT` or `DEVELOPER`	`string`	`"COGNITO_DEFAULT"`	no
email_configuration_from_email_address	Sender's email address or sender's display name with their email address (e.g. `[email protected]`, `John Smith <[email protected]>` or `"John Smith Ph.D." <[email protected]>)`. Escaped double quotes are required around display names that contain certain characters as specified in RFC 5322	`string`	`null`	no
email_configuration_reply_to_email_address	The REPLY-TO email address	`string`	`""`	no
email_configuration_source_arn	The ARN of the email source	`string`	`""`	no
email_mfa_configuration	Configuration block for configuring email Multi-Factor Authentication (MFA)	object({ message = string subject = string })	`null`	no
email_verification_message	A string representing the email verification message	`string`	`null`	no
email_verification_subject	A string representing the email verification subject	`string`	`null`	no
enable_propagate_additional_user_context_data	Enables the propagation of additional user context data	`bool`	`false`	no
enabled	Change to false to avoid deploying any resources	`bool`	`true`	no
identity_providers	Cognito Pool Identity Providers	`list(any)`	`[]`	no
ignore_schema_changes	Whether to ignore changes to Cognito User Pool schemas after creation. Set to true to prevent perpetual diffs when using custom schemas. This prevents AWS API errors since schema attributes cannot be modified or removed once created in Cognito. Due to Terraform limitations with conditional lifecycle blocks, this uses a dual-resource approach. Default is false for backward compatibility - set to true to enable the fix.	`bool`	`false`	no
lambda_config	A container for the AWS Lambda triggers associated with the user pool	`any`	`{}`	no
lambda_config_create_auth_challenge	The ARN of the lambda creating an authentication challenge.	`string`	`null`	no
lambda_config_custom_email_sender	A custom email sender AWS Lambda trigger.	`any`	`{}`	no
lambda_config_custom_message	A custom Message AWS Lambda trigger.	`string`	`null`	no
lambda_config_custom_sms_sender	A custom SMS sender AWS Lambda trigger.	`any`	`{}`	no
lambda_config_define_auth_challenge	Defines the authentication challenge.	`string`	`null`	no
lambda_config_kms_key_id	The Amazon Resource Name of Key Management Service Customer master keys. Amazon Cognito uses the key to encrypt codes and temporary passwords sent to CustomEmailSender and CustomSMSSender.	`string`	`null`	no
lambda_config_post_authentication	A post-authentication AWS Lambda trigger	`string`	`null`	no
lambda_config_post_confirmation	A post-confirmation AWS Lambda trigger	`string`	`null`	no
lambda_config_pre_authentication	A pre-authentication AWS Lambda trigger	`string`	`null`	no
lambda_config_pre_sign_up	A pre-registration AWS Lambda trigger	`string`	`null`	no
lambda_config_pre_token_generation	(deprecated) Allow to customize identity token claims before token generation	`string`	`null`	no
lambda_config_pre_token_generation_config	Allow to customize identity token claims before token generation	`any`	`{}`	no
lambda_config_user_migration	The user migration Lambda config type	`string`	`null`	no
lambda_config_verify_auth_challenge_response	Verifies the authentication challenge response	`string`	`null`	no
mfa_configuration	Set to enable multi-factor authentication. Must be one of the following values (ON, OFF, OPTIONAL)	`string`	`"OFF"`	no
number_schemas	A container with the number schema attributes of a user pool. Maximum of 50 attributes	`list(any)`	`[]`	no
password_policy	A container for information about the user pool password policy	object({ minimum_length = number, require_lowercase = bool, require_numbers = bool, require_symbols = bool, require_uppercase = bool, temporary_password_validity_days = number password_history_size = number })	`null`	no
password_policy_minimum_length	The minimum length of the password policy that you have set	`number`	`8`	no
password_policy_password_history_size	The number of previous passwords that users are prevented from reusing	`number`	`0`	no
password_policy_require_lowercase	Whether you have required users to use at least one lowercase letter in their password	`bool`	`true`	no
password_policy_require_numbers	Whether you have required users to use at least one number in their password	`bool`	`true`	no
password_policy_require_symbols	Whether you have required users to use at least one symbol in their password	`bool`	`true`	no
password_policy_require_uppercase	Whether you have required users to use at least one uppercase letter in their password	`bool`	`true`	no
password_policy_temporary_password_validity_days	The minimum length of the password policy that you have set	`number`	`7`	no
recovery_mechanisms	The list of Account Recovery Options	`list(any)`	`[]`	no
resource_server_identifier	An identifier for the resource server	`string`	`null`	no
resource_server_name	A name for the resource server	`string`	`null`	no
resource_server_scope_description	The scope description	`string`	`null`	no
resource_server_scope_name	The scope name	`string`	`null`	no
resource_servers	A container with the user_groups definitions	`list(any)`	`[]`	no
schemas	A container with the schema attributes of a user pool. Maximum of 50 attributes	`list(any)`	`[]`	no
sign_in_policy	Configuration block for sign-in policy. Allows configuring additional sign-in mechanisms like OTP	object({ allowed_first_auth_factors = list(string) })	`null`	no
sign_in_policy_allowed_first_auth_factors	List of allowed first authentication factors. Valid values: PASSWORD, EMAIL_OTP, SMS_OTP	`list(string)`	`[]`	no
sms_authentication_message	A string representing the SMS authentication message	`string`	`null`	no
sms_configuration	The SMS Configuration	`map(any)`	`{}`	no
sms_configuration_external_id	The external ID used in IAM role trust relationships	`string`	`""`	no
sms_configuration_sns_caller_arn	The ARN of the Amazon SNS caller. This is usually the IAM role that you've given Cognito permission to assume	`string`	`""`	no
sms_verification_message	A string representing the SMS verification message	`string`	`null`	no
software_token_mfa_configuration	Configuration block for software token MFA (multifactor-auth). mfa_configuration must also be enabled for this to work	`map(any)`	`{}`	no
software_token_mfa_configuration_enabled	If true, and if mfa_configuration is also enabled, multi-factor authentication by software TOTP generator will be enabled	`bool`	`false`	no
string_schemas	A container with the string schema attributes of a user pool. Maximum of 50 attributes	`list(any)`	`[]`	no
tags	A mapping of tags to assign to the User Pool	`map(string)`	`{}`	no
temporary_password_validity_days	The user account expiration limit, in days, after which the account is no longer usable	`number`	`7`	no
user_attribute_update_settings	Configuration block for user attribute update settings. Must contain key `attributes_require_verification_before_update` with list with only valid values of `email` and `phone_number`	`map(list(string))`	`null`	no
user_group_description	The description of the user group	`string`	`null`	no
user_group_name	The name of the user group	`string`	`null`	no
user_group_precedence	The precedence of the user group	`number`	`null`	no
user_group_role_arn	The ARN of the IAM role to be associated with the user group	`string`	`null`	no
user_groups	A container with the user_groups definitions	`list(any)`	`[]`	no
user_pool_add_ons	Configuration block for user pool add-ons to enable user pool advanced security mode features	`map(any)`	`{}`	no
user_pool_add_ons_advanced_security_mode	The mode for advanced security, must be one of `OFF`, `AUDIT` or `ENFORCED`	`string`	`null`	no
user_pool_name	The name of the user pool	`string`	n/a	yes
user_pool_tier	Cognito User Pool tier. Valid values: LITE, ESSENTIALS, PLUS.	`string`	`"ESSENTIALS"`	no
username_attributes	Specifies whether email addresses or phone numbers can be specified as usernames when a user signs up. Conflicts with `alias_attributes`	`list(string)`	`null`	no
username_configuration	The Username Configuration. Setting `case_sensitive` specifies whether username case sensitivity will be applied for all users in the user pool through Cognito APIs	`map(any)`	`{}`	no
verification_message_template	The verification message templates configuration	`map(any)`	`{}`	no
verification_message_template_default_email_option	The default email option. Must be either `CONFIRM_WITH_CODE` or `CONFIRM_WITH_LINK`. Defaults to `CONFIRM_WITH_CODE`	`string`	`null`	no
verification_message_template_email_message	The email message template for sending a confirmation code to the user, it must contain the `{####}` placeholder	`string`	`null`	no
verification_message_template_email_message_by_link	The email message template for sending a confirmation link to the user, it must contain the `{##Click Here##}` placeholder	`string`	`null`	no
verification_message_template_email_subject	The subject line for the email message template for sending a confirmation code to the user	`string`	`null`	no
verification_message_template_email_subject_by_link	The subject line for the email message template for sending a confirmation link to the user	`string`	`null`	no

Outputs

Name	Description
arn	The ARN of the user pool
client_ids	The ids of the user pool clients
client_ids_map	The ids map of the user pool clients
client_secrets	The client secrets of the user pool clients
client_secrets_map	The client secrets map of the user pool clients
creation_date	The date the user pool was created
domain_app_version	The app version
domain_aws_account_id	The AWS account ID for the user pool owner
domain_cloudfront_distribution	The name of the CloudFront distribution
domain_cloudfront_distribution_arn	The ARN of the CloudFront distribution
domain_cloudfront_distribution_zone_id	The ZoneID of the CloudFront distribution
domain_s3_bucket	The S3 bucket where the static files for this domain are stored
endpoint	The endpoint name of the user pool. Example format: cognito-idp.REGION.amazonaws.com/xxxx_yyyyy
id	The id of the user pool
last_modified_date	The date the user pool was last modified
name	The name of the user pool
resource_servers_scope_identifiers	A list of all scopes configured in the format identifier/scope_name
user_group_arns	The ARNs of the user groups
user_group_ids	The ids of the user groups
user_group_names	The names of the user groups
user_groups_map	A map of user group names to their properties

Know issues

Removing all lambda triggers

If you define lambda triggers using the lambda_config block or any lambda_config_* variable and you want to remove all triggers, define the lambda_config block with an empty map {} and apply the plan. Then comment the lambda_config block or define it as null and apply the plan again.

This is needed because all parameters for the lambda_config block are optional and keeping all block attributes empty or null forces to create a lambda_config {} block very time a plan/apply is run.

Requirements

Name	Version
terraform	>= 1.3.0
aws	>= 5.95

Providers

Name	Version
aws	6.2.0

Modules

No modules.

Resources

Name	Type
aws_cognito_identity_provider.identity_provider	resource
aws_cognito_resource_server.resource	resource
aws_cognito_user_group.main	resource
aws_cognito_user_pool.pool	resource
aws_cognito_user_pool.pool_with_schema_ignore	resource
aws_cognito_user_pool_client.client	resource
aws_cognito_user_pool_domain.domain	resource
aws_cognito_user_pool_ui_customization.default_ui_customization	resource
aws_cognito_user_pool_ui_customization.ui_customization	resource

Inputs

Name	Description	Type	Default	Required
admin_create_user_config	The configuration for AdminCreateUser requests	`map(any)`	`{}`	no
admin_create_user_config_allow_admin_create_user_only	Set to True if only the administrator is allowed to create user profiles. Set to False if users can sign themselves up via an app	`bool`	`true`	no
admin_create_user_config_email_message	The message template for email messages. Must contain `{username}` and `{####}` placeholders, for username and temporary password, respectively	`string`	`"{username}, your verification code is` {####}`"`	no
admin_create_user_config_email_subject	The subject line for email messages	`string`	`"Your verification code"`	no
admin_create_user_config_sms_message	- The message template for SMS messages. Must contain `{username}` and `{####}` placeholders, for username and temporary password, respectively	`string`	`"Your username is {username} and temporary password is` {####}`"`	no
alias_attributes	Attributes supported as an alias for this user pool. Possible values: phone_number, email, or preferred_username. Conflicts with `username_attributes`	`list(string)`	`null`	no
auto_verified_attributes	The attributes to be auto-verified. Possible values: email, phone_number	`list(string)`	`[]`	no
client_access_token_validity	Time limit, between 5 minutes and 1 day, after which the access token is no longer valid and cannot be used. This value will be overridden if you have entered a value in `token_validity_units`.	`number`	`60`	no
client_allowed_oauth_flows	The name of the application client	`list(string)`	`[]`	no
client_allowed_oauth_flows_user_pool_client	Whether the client is allowed to follow the OAuth protocol when interacting with Cognito user pools	`bool`	`true`	no
client_allowed_oauth_scopes	List of allowed OAuth scopes (phone, email, openid, profile, and aws.cognito.signin.user.admin)	`list(string)`	`[]`	no
client_auth_session_validity	Amazon Cognito creates a session token for each API request in an authentication flow. AuthSessionValidity is the duration, in minutes, of that session token. Your user pool native user must respond to each authentication challenge before the session expires. Valid values between 3 and 15. Default value is 3.	`number`	`3`	no
client_callback_urls	List of allowed callback URLs for the identity providers	`list(string)`	`[]`	no
client_default_redirect_uri	The default redirect URI. Must be in the list of callback URLs	`string`	`""`	no
client_enable_token_revocation	Whether the client token can be revoked	`bool`	`true`	no
client_explicit_auth_flows	List of authentication flows (ADMIN_NO_SRP_AUTH, CUSTOM_AUTH_FLOW_ONLY, USER_PASSWORD_AUTH)	`list(string)`	`[]`	no
client_generate_secret	Should an application secret be generated	`bool`	`true`	no
client_id_token_validity	Time limit, between 5 minutes and 1 day, after which the ID token is no longer valid and cannot be used. Must be between 5 minutes and 1 day. Cannot be greater than refresh token expiration. This value will be overridden if you have entered a value in `token_validity_units`.	`number`	`60`	no
client_logout_urls	List of allowed logout URLs for the identity providers	`list(string)`	`[]`	no
client_name	The name of the application client	`string`	`null`	no
client_prevent_user_existence_errors	Choose which errors and responses are returned by Cognito APIs during authentication, account confirmation, and password recovery when the user does not exist in the user pool. When set to ENABLED and the user does not exist, authentication returns an error indicating either the username or password was incorrect, and account confirmation and password recovery return a response indicating a code was sent to a simulated destination. When set to LEGACY, those APIs will return a UserNotFoundException exception if the user does not exist in the user pool.	`string`	`null`	no
client_read_attributes	List of user pool attributes the application client can read from	`list(string)`	`[]`	no
client_refresh_token_validity	The time limit in days refresh tokens are valid for. Must be between 60 minutes and 3650 days. This value will be overridden if you have entered a value in `token_validity_units`	`number`	`30`	no
client_supported_identity_providers	List of provider names for the identity providers that are supported on this client	`list(string)`	`[]`	no
client_token_validity_units	Configuration block for units in which the validity times are represented in. Valid values for the following arguments are: `seconds`, `minutes`, `hours` or `days`.	`any`	{ "access_token": "minutes", "id_token": "minutes", "refresh_token": "days" }	no
client_write_attributes	List of user pool attributes the application client can write to	`list(string)`	`[]`	no
clients	A container with the clients definitions	`any`	`[]`	no
default_ui_customization_css	CSS file content for default UI customization	`string`	`null`	no
default_ui_customization_image_file	Image file path for default UI customization	`string`	`null`	no
deletion_protection	When active, DeletionProtection prevents accidental deletion of your user pool. Before you can delete a user pool that you have protected against deletion, you must deactivate this feature. Valid values are `ACTIVE` and `INACTIVE`.	`string`	`"INACTIVE"`	no
device_configuration	The configuration for the user pool's device tracking	`map(any)`	`{}`	no
device_configuration_challenge_required_on_new_device	Indicates whether a challenge is required on a new device. Only applicable to a new device	`bool`	`null`	no
device_configuration_device_only_remembered_on_user_prompt	If true, a device is only remembered on user prompt	`bool`	`null`	no
domain	Cognito User Pool domain	`string`	`null`	no
domain_certificate_arn	The ARN of an ISSUED ACM certificate in us-east-1 for a custom domain	`string`	`null`	no
domain_managed_login_version	The version number of managed login for your domain. 1 for hosted UI (classic), 2 for the newer managed login	`number`	`1`	no
email_configuration	The Email Configuration	`map(any)`	`{}`	no
email_configuration_configuration_set	The name of the configuration set	`string`	`null`	no
email_configuration_email_sending_account	Instruct Cognito to either use its built-in functional or Amazon SES to send out emails. Allowed values: `COGNITO_DEFAULT` or `DEVELOPER`	`string`	`"COGNITO_DEFAULT"`	no
email_configuration_from_email_address	Sender's email address or sender's display name with their email address (e.g. `[email protected]`, `John Smith <[email protected]>` or `"John Smith Ph.D." <[email protected]>)`. Escaped double quotes are required around display names that contain certain characters as specified in RFC 5322	`string`	`null`	no
email_configuration_reply_to_email_address	The REPLY-TO email address	`string`	`""`	no
email_configuration_source_arn	The ARN of the email source	`string`	`""`	no
email_mfa_configuration	Configuration block for configuring email Multi-Factor Authentication (MFA)	object({ message = string subject = string })	`null`	no
email_verification_message	A string representing the email verification message	`string`	`null`	no
email_verification_subject	A string representing the email verification subject	`string`	`null`	no
enable_propagate_additional_user_context_data	Enables the propagation of additional user context data	`bool`	`false`	no
enabled	Change to false to avoid deploying any resources	`bool`	`true`	no
identity_providers	Cognito Pool Identity Providers	`list(any)`	`[]`	no
ignore_schema_changes	Whether to ignore changes to Cognito User Pool schemas after creation. Set to true to prevent perpetual diffs when using custom schemas. This prevents AWS API errors since schema attributes cannot be modified or removed once created in Cognito. Due to Terraform limitations with conditional lifecycle blocks, this uses a dual-resource approach. Default is false for backward compatibility - set to true to enable the fix.	`bool`	`false`	no
lambda_config	A container for the AWS Lambda triggers associated with the user pool	`any`	`{}`	no
lambda_config_create_auth_challenge	The ARN of the lambda creating an authentication challenge.	`string`	`null`	no
lambda_config_custom_email_sender	A custom email sender AWS Lambda trigger.	`any`	`{}`	no
lambda_config_custom_message	A custom Message AWS Lambda trigger.	`string`	`null`	no
lambda_config_custom_sms_sender	A custom SMS sender AWS Lambda trigger.	`any`	`{}`	no
lambda_config_define_auth_challenge	Defines the authentication challenge.	`string`	`null`	no
lambda_config_kms_key_id	The Amazon Resource Name of Key Management Service Customer master keys. Amazon Cognito uses the key to encrypt codes and temporary passwords sent to CustomEmailSender and CustomSMSSender.	`string`	`null`	no
lambda_config_post_authentication	A post-authentication AWS Lambda trigger	`string`	`null`	no
lambda_config_post_confirmation	A post-confirmation AWS Lambda trigger	`string`	`null`	no
lambda_config_pre_authentication	A pre-authentication AWS Lambda trigger	`string`	`null`	no
lambda_config_pre_sign_up	A pre-registration AWS Lambda trigger	`string`	`null`	no
lambda_config_pre_token_generation	(deprecated) Allow to customize identity token claims before token generation	`string`	`null`	no
lambda_config_pre_token_generation_config	Allow to customize identity token claims before token generation	`any`	`{}`	no
lambda_config_user_migration	The user migration Lambda config type	`string`	`null`	no
lambda_config_verify_auth_challenge_response	Verifies the authentication challenge response	`string`	`null`	no
mfa_configuration	Set to enable multi-factor authentication. Must be one of the following values (ON, OFF, OPTIONAL)	`string`	`"OFF"`	no
number_schemas	A container with the number schema attributes of a user pool. Maximum of 50 attributes	`list(any)`	`[]`	no
password_policy	A container for information about the user pool password policy	object({ minimum_length = number, require_lowercase = bool, require_numbers = bool, require_symbols = bool, require_uppercase = bool, temporary_password_validity_days = number password_history_size = number })	`null`	no
password_policy_minimum_length	The minimum length of the password policy that you have set	`number`	`8`	no
password_policy_password_history_size	The number of previous passwords that users are prevented from reusing	`number`	`0`	no
password_policy_require_lowercase	Whether you have required users to use at least one lowercase letter in their password	`bool`	`true`	no
password_policy_require_numbers	Whether you have required users to use at least one number in their password	`bool`	`true`	no
password_policy_require_symbols	Whether you have required users to use at least one symbol in their password	`bool`	`true`	no
password_policy_require_uppercase	Whether you have required users to use at least one uppercase letter in their password	`bool`	`true`	no
password_policy_temporary_password_validity_days	The minimum length of the password policy that you have set	`number`	`7`	no
recovery_mechanisms	The list of Account Recovery Options	`list(any)`	`[]`	no
resource_server_identifier	An identifier for the resource server	`string`	`null`	no
resource_server_name	A name for the resource server	`string`	`null`	no
resource_server_scope_description	The scope description	`string`	`null`	no
resource_server_scope_name	The scope name	`string`	`null`	no
resource_servers	A container with the user_groups definitions	`list(any)`	`[]`	no
schemas	A container with the schema attributes of a user pool. Maximum of 50 attributes	`list(any)`	`[]`	no
sms_authentication_message	A string representing the SMS authentication message	`string`	`null`	no
sms_configuration	The SMS Configuration	`map(any)`	`{}`	no
sms_configuration_external_id	The external ID used in IAM role trust relationships	`string`	`""`	no
sms_configuration_sns_caller_arn	The ARN of the Amazon SNS caller. This is usually the IAM role that you've given Cognito permission to assume	`string`	`""`	no
sms_verification_message	A string representing the SMS verification message	`string`	`null`	no
software_token_mfa_configuration	Configuration block for software token MFA (multifactor-auth). mfa_configuration must also be enabled for this to work	`map(any)`	`{}`	no
software_token_mfa_configuration_enabled	If true, and if mfa_configuration is also enabled, multi-factor authentication by software TOTP generator will be enabled	`bool`	`false`	no
string_schemas	A container with the string schema attributes of a user pool. Maximum of 50 attributes	`list(any)`	`[]`	no
tags	A mapping of tags to assign to the User Pool	`map(string)`	`{}`	no
temporary_password_validity_days	The user account expiration limit, in days, after which the account is no longer usable	`number`	`7`	no
user_attribute_update_settings	Configuration block for user attribute update settings. Must contain key `attributes_require_verification_before_update` with list with only valid values of `email` and `phone_number`	`map(list(string))`	`null`	no
user_group_description	The description of the user group	`string`	`null`	no
user_group_name	The name of the user group	`string`	`null`	no
user_group_precedence	The precedence of the user group	`number`	`null`	no
user_group_role_arn	The ARN of the IAM role to be associated with the user group	`string`	`null`	no
user_groups	A container with the user_groups definitions	`list(any)`	`[]`	no
user_pool_add_ons	Configuration block for user pool add-ons to enable user pool advanced security mode features	`map(any)`	`{}`	no
user_pool_add_ons_advanced_security_mode	The mode for advanced security, must be one of `OFF`, `AUDIT` or `ENFORCED`	`string`	`null`	no
user_pool_name	The name of the user pool	`string`	n/a	yes
user_pool_tier	Cognito User Pool tier. Valid values: LITE, ESSENTIALS, PLUS.	`string`	`"ESSENTIALS"`	no
username_attributes	Specifies whether email addresses or phone numbers can be specified as usernames when a user signs up. Conflicts with `alias_attributes`	`list(string)`	`null`	no
username_configuration	The Username Configuration. Setting `case_sensitive` specifies whether username case sensitivity will be applied for all users in the user pool through Cognito APIs	`map(any)`	`{}`	no
verification_message_template	The verification message templates configuration	`map(any)`	`{}`	no
verification_message_template_default_email_option	The default email option. Must be either `CONFIRM_WITH_CODE` or `CONFIRM_WITH_LINK`. Defaults to `CONFIRM_WITH_CODE`	`string`	`null`	no
verification_message_template_email_message	The email message template for sending a confirmation code to the user, it must contain the `{####}` placeholder	`string`	`null`	no
verification_message_template_email_message_by_link	The email message template for sending a confirmation link to the user, it must contain the `{##Click Here##}` placeholder	`string`	`null`	no
verification_message_template_email_subject	The subject line for the email message template for sending a confirmation code to the user	`string`	`null`	no
verification_message_template_email_subject_by_link	The subject line for the email message template for sending a confirmation link to the user	`string`	`null`	no

Outputs

Name	Description
arn	The ARN of the user pool
client_ids	The ids of the user pool clients
client_ids_map	The ids map of the user pool clients
client_secrets	The client secrets of the user pool clients
client_secrets_map	The client secrets map of the user pool clients
creation_date	The date the user pool was created
domain_app_version	The app version
domain_aws_account_id	The AWS account ID for the user pool owner
domain_cloudfront_distribution	The name of the CloudFront distribution
domain_cloudfront_distribution_arn	The ARN of the CloudFront distribution
domain_cloudfront_distribution_zone_id	The ZoneID of the CloudFront distribution
domain_s3_bucket	The S3 bucket where the static files for this domain are stored
endpoint	The endpoint name of the user pool. Example format: cognito-idp.REGION.amazonaws.com/xxxx_yyyyy
id	The id of the user pool
last_modified_date	The date the user pool was last modified
name	The name of the user pool
resource_servers_scope_identifiers	A list of all scopes configured in the format identifier/scope_name
user_group_arns	The ARNs of the user groups
user_group_ids	The ids of the user groups
user_group_names	The names of the user groups
user_groups_map	A map of user group names to their properties

Name		Name	Last commit message	Last commit date
Latest commit History 388 Commits
.github/workflows		.github/workflows
examples		examples
test		test
.gitignore		.gitignore
.pre-commit-config.yaml		.pre-commit-config.yaml
.release-please-config.json		.release-please-config.json
.release-please-manifest.json		.release-please-manifest.json
CHANGELOG.md		CHANGELOG.md
CLAUDE.md		CLAUDE.md
Claude Code Slash Commands.md		Claude Code Slash Commands.md
LICENSE		LICENSE
MIGRATION_GUIDE.md		MIGRATION_GUIDE.md
README.md		README.md
bug_fix_summary.md		bug_fix_summary.md
client.tf		client.tf
domain.tf		domain.tf
identity-provider.tf		identity-provider.tf
main.tf		main.tf
managed-login-branding.tf		managed-login-branding.tf
outputs.tf		outputs.tf
renovate.json		renovate.json
resource-server.tf		resource-server.tf
ui-customization.tf		ui-customization.tf
user-group.tf		user-group.tf
variables.tf		variables.tf
versions.tf		versions.tf

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lgallard/terraform-aws-cognito-user-pool

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terraform-aws-cognito-user-pool

Usage

Example (simple)

Example (conditional creation)

Example (complete)

Schema Management

⚠️ Important: Schema Perpetual Diff Fix Available

The Schema Perpetual Diff Problem

✅ Solution: Enable Schema Change Ignore

🔧 Technical Implementation Details

🔄 Migration for Existing Deployments

📝 Adding New Schema Attributes

💡 Best Practices

Managed Login Branding

🎨 Features

📋 Requirements

🚀 Quick Start

📁 Complete Example

🎯 Asset Categories

⚠️ Important Notes

🔒 Security Considerations

🔧 Troubleshooting

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