Genesys Cloud - Main

Is there an API to get the user name and the user ID associated with the user name?
If possible, I would like to get all the agents who belong to the queue etc.

Yes, the User API's can do this, but an easier way would be to use the CLI (Platform API CLI (genesys.cloud)) and run this command:

gc users list --autopaginate  | jq -r ".[] | [.name, .id] | @csv" > output.csv

To get it by a queue, you need to use the routing API/CLI and put in the queue GUID.

gc routing queues members list {QUEUEID} --autopaginate  | jq -r ".[] | [.name, .id] | @csv" > output.csv

Thank you for your reply!
I agree that the CLI is easier.
Excuse me, I would like to know how to do it with API.

You could do it with the routing API:  https://developer.genesys.cloud/devapps/api-explorer#get-api-v2-routing-queues--queueId--members

You will need to supply the QueueId and the parse the JSON response.