$("#auth").on("submit", function submit(e) { e.preventDefault(); var input_password = $("#password"); let password = input_password.val(); input_password.val(""); $.ajax({ url: "/AUTH", type: "POST", contentType: "text/plain", data: password, dataType: "json", success: function (resp) { if (resp.status) { $.cookie("token", resp.token, {expires: 7, path: '/'}); input_password.removeClass("is-invalid"); input_password.addClass("is-valid"); $(".btn-secondary").css("display", "block"); } else { input_password.removeClass("is-valid"); input_password.addClass("is-invalid"); } }, failure: function (err) { alert(err); } }); });