# Listing users in a collection
<a name="list-users"></a>

You can use the [ListUsers](https://docs.aws.amazon.com/rekognition/latest/APIReference/API_ListUsers.html) operation to list UserIds and the UserStatus. To see the FaceIDs that are associated with a UserID, use the [ListFaces](https://docs.aws.amazon.com/rekognition/latest/APIReference/API_ListFaces.html) operation.

**To list users (SDK)**

1. If you haven't already:

   1. Create or update a user with `AmazonRekognitionFullAccess` permissions. For more information, see [Step 1: Set up an AWS account and create a User](setting-up.md#setting-up-iam).

   1. Install and configure the AWS CLI and the AWS SDKs. For more information, see [Step 2: Set up the AWS CLI and AWS SDKs](setup-awscli-sdk.md).

1. Use the following examples to call the `ListUsers` operation.

------
#### [ Java ]

   This Java example lists the users in a collection using the `ListUsers` operation.

   ```
   import java.util.List;
   import com.amazonaws.services.rekognition.AmazonRekognition;
   import com.amazonaws.services.rekognition.AmazonRekognitionClientBuilder;
   import com.amazonaws.services.rekognition.model.ListUsersRequest;
   import com.amazonaws.services.rekognition.model.ListUsersResult;
   import com.amazonaws.services.rekognition.model.User;
   
   public class ListUsers {
   
       public static void main(String[] args) throws Exception {
   
   
           AmazonRekognition amazonRekognition = AmazonRekognitionClientBuilder.defaultClient();
   
   
           System.out.println("Listing users");
           int limit = 10;
           ListUsersResult listUsersResult = null;
           String paginationToken = null;
           do {
               if (listUsersResult != null) {
                   paginationToken = listUsersResult.getNextToken();
               }
               ListUsersRequest request = new ListUsersRequest()
                       .withCollectionId(collectionId)
                       .withMaxResults(limit)
                       .withNextToken(paginationToken);
               listUsersResult = amazonRekognition.listUsers(request);
   
               List<User> users = listUsersResult.getUsers();
               for (User currentUser: users) {
                   System.out.println(currentUser.getUserId() + " : " + currentUser.getUserStatus());
               }
           } while (listUsersResult.getNextToken() != null);
       }
   }
   ```

------
#### [ AWS CLI ]

   This AWS CLI command lists the users in a collection with the `ListUsers` operation.

   ```
   aws rekognition list-users --collection-id {{collection-id}} --max-results {{number-of-max-results}}
   ```

------
#### [ Python ]

   The following example lists the users in a collection with the `ListUsers` operation.

   ```
   # Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
   # PDX-License-Identifier: MIT-0 (For details, see https://github.com/awsdocs/amazon-rekognition-developer-guide/blob/master/LICENSE-SAMPLECODE.)
   
   import boto3
   from botocore.exceptions import ClientError
   import logging
   from pprint import pprint
   
   logger = logging.getLogger(__name__)
   session = boto3.Session(profile_name='profile-name')
   client = session.client('rekognition')
   
   
   def list_users(collection_id):
       """
       List all users from the given collection
   
       :param collection_id: The ID of the collection where user is stored.
   
       :return: response that contains list of Users found within given collection
       """
       logger.info(f'Listing the users in collection: {collection_id}')
       try:
           response = client.list_users(
               CollectionId=collection_id
           )
           pprint(response["Users"])
       except ClientError:
           logger.exception(f'Failed to list all user from given collection: {collection_id}')
           raise
       else:
           return response
   
   def main():
       collection_id = "collection-id"
       list_users(collection_id)
   
   if __name__ == "__main__":
       main()
   ```

------

## ListUsers operation response
<a name="list-users-response"></a>

The response for a request to ListUsers includes a list of the `Users` in the collection along with the `UsedId` and `UserStatus` of the User.

```
{
    "NextToken": "B1asJT3bAb/ttuGgPFV8BZoBZyGQzlUHXbuTNLh48a6enU7kXKw43hpOwizW7LOk/Gk7Em09lznoq6+FcDCcSq2olrn7A98BLkt5keu+ZRVRUTyrXtT6J7Hmp+ieQ2an6Zu0qzPfcdPeaJ9eAxG2d0WNrzJgi5hvmjoiSTTfKX3MQz1sduWQkvAAs4hZfhZoKFahFlqWofshCXa/FHAAY3PL1PjxXbkNeSSMq8V7i1MlKCdrPVykCv9MokpPt7jtNvKPEZGUhxgBTFMxNWLEcFnzAiCWDg91dFy/LalshPjXA9UVc5Gx9vIJNQ/eO3cQRghAkCT3FOAiXsLAnA015ODTomZpWWVpqB21wKpI3LYmfAVFrDPGzpbTVlRmLsJm41bkmnBBBw9+DHz1Jn7zW+qc5Fs3yaHu0f51Xg==", 
    "Users": [
        {
            "UserId": "demoUser4", 
            "UserStatus": "CREATED"
        }, 
        {
            "UserId": "demoUser2", 
            "UserStatus": "CREATED"
        }
    ]
}
```