How to send data in JQuery ajax safely?

I send data through jquery $.ajax to the server and now that I have to send the id of the user I thought that this is not very safe ... since anyone who goes to source code or to inspect the code can see perfectly the variables, their values (they will see the user id), where I am sending and with what new variables are being sent.

$(document).on("click", '.boton', function () {
    var user = <?php echo $user_actual; ?>; // se ve así: var user = 2;
    var datos = <?php echo $get_datos; ?>; // se ve así: var datos = 11;
    $.ajax({
        url:'../backend.php',
        type:'GET',
        data:{user_ident:user, datos_ident:datos},
        success:function (data) {
        }
    });
});

What should I do? The only thing that occurs to me is to hide the JQuery with PHP echos.