Get channels based on a username - Official Channel List endpoint.
Get the Channel ID from the Username
If you only know the username of a channel, e.g. you want to get the channel ID for this URL: https://www.youtube.com/user/OfficialRyanSerhant
you want to enter the last part of the URL (e.g. OfficialRyanSerhant
) into this endpoint.
Execute the endpoint and then check the Raw JSON
tab to get the channel ID, e.g. the channel ID will be UCG98giOsUxIlXV0rNUhxLew
per the screenshot: