In October 2014, Vittorio Bertocci introduced ADAL JavaScript. This library makes it possible for single-page-apps to use Azure Active Directory authentication from within the browser. ADAL JS uses the OAuth2 Implicit Grant for this. The introductory blog post and an additional post when v1 was released explain in detail how to configure and use the library.
Combining ADAL JS with role-based security in ASP.NET Web API
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