When using AWS/Cognito and setting up a user pool with CDK, is there a way to specify the character limits for standard attributes? Specifically, I would like to establish a minimum and maximum

When setting up a user pool in AWS/Cognito using CDK, how can I specify the string length for standard attributes?

I've been trying to figure this out but haven't had any luck so far. I'm working with Typescript.

This is how my user pool is set up:

const userPool = new cognito.UserPool(this, `name-of-user-pool-${stage}`, {
  signInAliases: {
    email: true,
    username: false,
  },
  standardAttributes: {
    fullname: { required: true, mutable: true }, // This is where I want to set the string length
  },
  passwordPolicy: {
    minLength: 8,
    requireDigits: true,
    requireLowercase: true,
    requireUppercase: true,
    requireSymbols: true,
  },
  selfSignUpEnabled: true,
  userVerification: {
    emailSubject: 'Verify your email !',
    emailBody: 'Thank you for signing up to our app! Your verification code is {####}',
    emailStyle: cognito.VerificationEmailStyle.CODE,
  },
  accountRecovery: cognito.AccountRecovery.EMAIL_ONLY,
});
typescriptamazon-web-servicesamazon-cognitoaws-cdkaws-userpools

Answer №1

Creating a custom attribute with specific length limitations could be a good alternative, although I am unsure if there are any hidden implications associated with this approach. It is worth noting that CDK does not raise any complaints when using the same name as a standard attribute, as long as it is not already in use.

const customAttribute: ICustomAttribute = {
  bind: (): CustomAttributeConfig => 
    mutable: true,
    dataType: 'String',
    stringConstraints: {
      maxLen: 30,
      minLen: 10
    }
  })
}

const userPool = new UserPool(this, 'TestUserPool', {
  ...
  customAttributes: {
    customAttribute
  }
})

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