What is the format of user pool id for AWS CognitoIdentity?

Question

I need to get a list of users in my Cognito pool using AWS javascript SDK. I was going to use CognitoIdentity class and the following method to get user list:

var params = {
  IdentityPoolId: 'STRING_VALUE', /* required */
  ...
};
cognitoidentity.listIdentities(params, function(err, data) {
  ...
});

However, it requires IdentityPoolId in a very strange format:

An identity pool ID in the format REGION:GUID.

The check for which looks like:

[\w-]+:[0-9a-f-]+

That is, region name should be without numbers. However, most of the regions have numbers, for example, my region is "ap-northeast-1". Both Pool Id and Pool ARN values don't match. What is the real format of this id and where to get the value for my user pool?

Answer 1

The example of the IdentityPoolId is provided in the API documentation for ListIdentities:

An identity pool ID in the format REGION:GUID.

Pattern: [\w-]+:[0-9a-f-]+

Example given:

"IdentityPoolId": "us-east-1:509f9747-5b5d-484e-a2d7-74fcba108147"