How to get thumbnail of YouTube video link using YouTube API?

Each YouTube video has 4 generated images. They are predictably formatted as follows:<insert-youtube-video-id-here>/0.jpg<insert-youtube-video-id-here>/1.jpg<insert-youtube-video-id-here>/2.jpg<insert-youtube-video-id-here>/3.jpg

The first one in the list is a full size image and others are thumbnail images. The default thumbnail image (ie. one of 1.jpg, 2.jpg, 3.jpg) is:<insert-youtube-video-id-here>/default.jpg

For the high quality version of the thumbnail use a url similar to this:<insert-youtube-video-id-here>/hqdefault.jpg

There is also a medium quality version of the thumbnail, using a url similar to the HQ:<insert-youtube-video-id-here>/mqdefault.jpg

For the maximum resolution version of the thumbnail use a url similar to this:<insert-youtube-video-id-here>/maxresdefault.jpg

All of the above urls are available over https too. Just change http to https in any of the above urls.

Alternatively, you can use the YouTube API to get thumbnail images.