To get the Dynamics 365 user name and user id in JavaScript, create a function and attach and publish:
function GetUser() {
var UserId = Xrm.Page.context.getUserId();
var UserName = Xrm.Page.context.getUserName();
alert(UserId + " " + UserName);
}

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Do you know what the updated way to do this is, now that Xrm.Page is being depreciated?
Hi Ben,
Please try this globalContext.userSettings.userId and globalContext.userSettings.userName – https://carldesouza.com/dynamics-365-client-api-changes-globalcontext/
Hello
That method works to create a function that returns me values that the user has in his id and to be able to use them to iron them in fields of the entity that he is working on?
Hi Sir, Good Morning Since I am new to D 365 Could you Please help me to understand where should I register this code? I Mean on which entity?
Hey,
A bit late. but did anyone tried to get modified by user id?