How to get the logged in user details(user email id and user name) using Access Token in AAD Single Sign on using java script back-end?

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Azure

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Hi am developing a windows store 8.1 app using C# and xaml

For log in, am authenticating the user with Windows Azure Active directory Single Sign-on using JavaScript back-end.

Once the user is logged in and i have the access token, how to get the logged in user's user email id and Username using the access token in the app?

Anybody please provide me a solution to get the user email using the access token?