I am able to get search results, playlists of an user using Youtube Javascript API.
How can i get the watched history of an user using Youtube Javascript API???
Here's the general procedure:
1) Get the "watch History" playlist of a given user's channel (as a channel ID is the key to getting user info). Note that this will ONLY work when a user is authenticated via oAuth2.
https://www.googleapis.com/youtube/v3/channels?part=contentDetails&mine=true&key={YOUR_API_KEY}
With that response, there should be a "watchHistory" playlist ... take it and call the playlistItems endpoint:
https://www.googleapis.com/youtube/v3/playlistItems?part=snippet&playlistId=HLTFxEo9ofKM2Siifxoy5V_A&key={YOUR_API_KEY}
Unfortunately, many users are reporting there's a bug in the watch history playlist through the API right now:
https://code.google.com/p/gdata-issues/issues/detail?id=4642
So your mileage may vary.