Session token in javascript

Question

My javascript calls a post request from an API. I would like to somehow save the json response and reuse it as authentication to get data.

This is what I have so far...

Post Javascript request:

 $(document).ready(function () {
    $("#login").click(function () {

        console.log("click");
        url = "/api/Users/authenticate";
        var username = document.getElementById("username").value;
        var password = document.getElementById("password").value;
        s = '{"userName": "' + username + '","userPassword": "' + password + '"}';
        callback = function (data) {
            alert("User Logged In.");
            var response = jQuery.parseJSON(data);
            var token = response[3];
            sessionStorage.setItem("token",token)
        };
        callbackerror = function (data) { alert("Error"); };
        $.ajax({
            type: "POST",
            url: url,
            data: s,
            success: callback,
            error: callbackerror,
            processData: false,
            contentType: 'application/json'

        });
    });
});

Get Javascript Request:

function loadUsers() {
    url = "/api/Users/";
    callback = function (data) {
        var htmldata = "";
        $.each(data, function (i, item) {
            htmldata += '<div class="row">' +
                '<div class="col-sm-3">' + item.userID + '</div>' +
                '<div class="col-sm-3">' + item.userName + '</div>' +
                '<div class="col-sm-3">' + item.currentLotUsed + '</div>' +
                '<div class="col-sm-3">' + item.carparkid + '</div>' +
                '</div>'
        });
        $("#carparkview").html(htmldata);
    };
    callbackerror = function (data) { alert("Error"); };
    $.ajax({
        type: "GET",
        url: url,
        headers: {
            'Authorization': 'Bearer ' + sessionStorage.getItem("token")
        },
        data: {},
        success: callback,
        error: callbackerror
    });
};
$(document).ready(loadUsers);

My json response:

{
"id": "355e91da-87e7-4c03-a5d0-860ced6cc590",
"username": "Dick123",
"name": "Dickson",
"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1bmlxdWVfbmFtZSI6IjM1NWU5MWRhLTg3ZTctNGMwMy1hNWQwLTg2MGNlZDZjYzU5MCIsIm5iZiI6MTU0NzgzMzQzNSwiZXhwIjoxNTQ4NDM4MjM1LCJpYXQiOjE1NDc4MzM0MzV9.xkrloD3isYY7XvvAY2KZJODNSwDKFBV30rECEDpMRZo"
}

I am using asp.net and mvc. My code doesn't work and I can't think of a solution to solve this problem. Please give me some advice, I need help.