Is it possible to POST from the same URL without refreshing the page?

I'm using ajax to do so and am responding with res.end on the backend but so far, I can only POST once. Here is my code:

Server

app.post("/awesome", passwordless.restricted({ failureRedirect: "/" }), (req, res, next) => {
  // ...do a bunch of stuff
  res.end();
});

Client

$("[data-new-save]").on("click", function () {
  $.ajax({
    url: "/awesome",
    type: "POST",
    data: awesomeDetails,
    success: function () {
      console.log("Cool beans");
      refreshContent(); // Re-renders content

      // Feedback
      $("nav").after("<div class=\"flash success\">Success!</div>");

      setTimeout(function () {
        $(".flash").remove();
      }, 5000);
    },
    error: function () {
      console.log("Welp");

      // Feedback
      $(".navigation").after("<div class=\"flash error\">Failure</div>");

      setTimeout(function () {
        $(".flash").remove();
      }, 5000);
    }
  });
});

via NetOperator Wibby