With Youtube api v2, there's easy way to get videos. Just send a query like this:
The Youtube api v2 also has an interactive demo page for building query: http://gdata.youtube.com/demo/index.html
With Youtube api v3, I don't know the corresponding way. Please point me the way with api v3.
Thank you!
The channels#list method will return a JSON with some information about the channel, including the playlist ID for the "uploads" playlist:
https://www.googleapis.com/youtube/v3/channels?part=contentDetails&forUsername=OneDirectionVEVO&key={YOUR_API_KEY}
With the playlist ID you can get the videos with the playlistItems#list method:
https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&playlistId=UUbW18JZRgko_mOGm5er8Yzg&key={YOUR_API_KEY}
You can test those at the end of the documentation pages.