public/index.html

<!DOCTYPE html>
<html>
  <head>
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    <title>OC835 - Cameras</title>
  </head>

  <body>
    <div class="root">
      <div class="lds-ripple">
        <div></div>
        <div></div>
      </div>
    </div>
    <script type="text/javascript">
      const getCameras = async () => {
        const cameras = JSON.parse(window.localStorage.getItem("cameras"));
        if (cameras === null) {
          const response = await fetch("api/cameras");
          const data = await response.json();
          window.localStorage.setItem("camera", JSON.stringify(data));
          return data;
        } else {
          return cameras;
        }
      };

      (function (window) {
        getCameras().then((cameras) => {
          document.getElementsByClassName("root")[0].innerHTML = cameras
            .map(
              (x) => `
      <div class="card">
        <a href="//${x}/img/video.mjpeg">
            <img src="//${x}/img/video.mjpeg" />
        </a>
      </div>`
            )
            .join("\n");
        });
      })(window);
    </script>
  </body>
</html>