How to get current connected cognito user

Generally speaking, when you log in with Cognito there's an identity token that's returned as part of the authentication response. This ID Token (in JWT format -- see this documentation for details on format) should be put into your session data -- most of the time this means storing the JWT in a browser cookie and passing it with subsequent requests to the web server. So if that's how you're storing your session data you should be able to pull the unique identifier of the logged in user from the sub field in the ID Token stored in HttpContext.Request.Cookies on the server side. You can also pull other useful fields like email and cognito:username.

Thanks a lot! So, I tried to get the JWT, but it didn't succeed. I found a javascript example on the Amazon documentation and that's exactly what I want (https://docs.aws.amazon.com/cognito/latest/developerguide/authentication.html). But, i get the error "AmazonCognitoIdentity is not defined".

So, this is my cshtml page. Is there a nuget package we need to import to use the AmazonCognitoIdentity in javascript?

@page

@{
    ViewData["Title"] = "Secure";
}

<h2>Login</h2>

<p>@Model.Message</p>

@section Scripts {
    <script type="text/JavaScript">

    $(document).ready(function () {
        alert("Start!!!");

        var pooldata = 
        {
            UserPoolID: '',
            ClientId: ''
        };

        var userPool = new AmazonCognitoIdentity.CognitoUserPool(pooldata);

        var cognitoUser = userPool.getCurrentUser();

        if (cognitoUser != null) 
        {
            alert("Welcome, " + cognitoUser.username);
        }
        else 
        {
            alert("Welcome, not connected");
        }

        alert("End!!!");
    });

    </script>
}