How to access list of website users from SharePoint hosted app?

Question

My app is hosted here:

https://mySite.sharepoint.com/sites/path/myApp/

And user information is hosted here:

https://mySite.sharepoint.com/sites/path/_catalogs/users/simple.aspx

I already use this code to access lists outside of my app

    function getLists() {

        print("retrieving list");

        var hostUrl = decodeURIComponent(getQueryStringParameter("SPHostUrl"));
        currentcontext = new SP.ClientContext.get_current();
        hostcontext = new SP.AppContextSite(currentcontext, hostUrl);
        web = hostcontext.get_web(); // hostcontext instead of currentcontext

        listCollection = web.get_lists();
        list = listCollection.getByTitle(LIST_NAME);

        listItemCollection = list.getItems(""); // use CAML query for specific requests

        context.load(listItemCollection);
        context.executeQueryAsync(sharePointReady, queryFailed);
    }

How can I adjust this code to get a list of all the users in my website like their name and contact information? Or is there another method?

Thanks in advance.

Answer 1

REST

/_api/Web/SiteUsers

JSOM

var ctx = SP.ClientContext.get_current();
var users = ctx.get_web().get_siteUsers();
ctx.load(users);
ctx.executeQueryAsync(function() {
  var userArray = [];
  var e = users.getEnumerator();
  while (e.moveNext()) {
    userArray.push(e.get_current());
  }
  console.log(userArray);
});

Answer 2

In this case list = listCollection.getByTitle(LIST_NAME); would become list = listCollection.getByTitle("UserInformationList"); or list = listCollection.getByTitle("User Information List");.

That is the underlying list where the users are stored.