Sending a cookie on a request with JS

I have a login screen that gives access to a people viewing screen. I need to pass a cookie to the request that will call this list of people (which is an HTML file and inside it, has a JS file that gets these people from my API). Can anyone explain me how I can do this? Create two js files:

cookie-manager.js

var CookieManager = (function(){'

const set = function(token){
    var date = new Date();
    date.setTime(date.getTime() + 7*24*60*60*1000);
    var expString = "expires=" + date.toGMTString();
    document.cookie = 'token=${token};' + expString;
}

const get = function(cname){
    var name = cname + "=";
    var decodedCookie = decodeURIComponent(document.cookie);
    var ca = decodedCookie.split(';');
    for(var i = 0; i <ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1);
        }
        if (c.indexOf(name) == 0) {
            return c.substring(name.length, c.length);
        }
    }
    return "";
}

return {
    set : set,
    get : get
}

auth-controller.js

var AuthController = (function(){

const loginAdmin = function(){
    let formControl = new FormControl({
        action : "http://localhost:8080/auth",
        formElement : document.querySelector("#auth")
    });

    formControl.data = formControl.serialize(formControl.formElement);

    formControl.data.roleForm = "ADMIN";

    formControl.submit(function(response){
        if(response.status && response.status != 200){
            new Messages({
                type : "danger",
                messages : ["Credenciais Inválidas"]
            }).build().show();
        }else{
            new Messages({
                type : "info",
                messages : ["Aguarde você está sendo redirecionado."]
            }).build().show();

            CookieManager.set(response.data.token);

            setTimeout(function(){
                CookieManager.get();
                location.href = "tabela-participantes.html";
            }, 3000);


        }
    });


}

return {
    loginAdmin : loginAdmin
}

})();