Yes, like I just said, send the request with the id parameter and you’ll get a response along the lines of:
{
"data": [{
"id": "44322889",
"login": "dallas",
"display_name": "dallas",
"type": "staff",
"broadcaster_type": "",
"description": "Just a gamer playing games and chatting. :)",
"profile_image_url": "https://static-cdn.jtvnw.net/jtv_user_pictures/dallas-profile_image-1a2c906ee2c35f12-300x300.png",
"offline_image_url": "https://static-cdn.jtvnw.net/jtv_user_pictures/dallas-channel_offline_image-1a2c906ee2c35f12-1920x1080.png",
"view_count": 191836881,
"email": "login@provider.com"
}]
}
Login is their username.