Working with SharePoint Site Permissions using PnP JavaScript Core Library

Here let us look at the working with SharePoint site permissions using the PnP JavaScript library. Some of the basic operations like retrieve available permissions, add or remove the user permissions from the site will be explained.

Note: 

• PnP JavaScript Core Library is supported on SharePoint 2013, SharePoint 2016 and SharePoint Online versions.
• The prerequisites for the operations are es6-promise.js, fetch.js, pnp.js or pnp.min.js.

The following sample shows us retrieving all user permissions of the SharePoint site along with the user roles using PnP JavaScript Core library.

Azure Active Directory App Authentications

Azure AD App registrations provides ways for authenticating or authorizing the user custom applications which uses Azure AD, to access the data available on the Microsoft products/services.

Why Azure AD App Registration? You might have already worked with custom applications that uses Azure Control Service, which provides way for authenticating users to gain access to web applications and services. As ACS is getting deprecated, Microsoft provides ways for authenticating the applications and provides way for enabling permissions for users to access the data. 

(Source: https://cloudblogs.microsoft.com/enterprisemobility/2013/06/22/azure-active-directory-is-the-future-of-acs/)