In V2 you could hit the /api/users/default path to get infomation such as the user\'s username. This is documented here: https://developers.google.com/youtube/2
/api/users/default
Youtube API v3 does not support user information any more. Use userinfo API.
set scope: https://www.googleapis.com/auth/youtube.force-ssl https://www.googleapis.com/auth/userinfo.profile (a space between scopes)
https://www.googleapis.com/auth/youtube.force-ssl https://www.googleapis.com/auth/userinfo.profile
and get: https://www.googleapis.com/oauth2/v1/userinfo?access_token={access_token}
https://www.googleapis.com/oauth2/v1/userinfo?access_token={access_token}