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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>requestMIDIAccess — safe</title>
</head>
<body>
  <button id="btn" type="button">Safe MIDI request</button>
  <pre id="out">Click to run the safe helper.</pre>
  <script>
    async function requestMidiAccessSafe(options) {
      if (typeof navigator.requestMIDIAccess !== "function") {
        return { ok: false, access: null, reason: "unsupported" };
      }
      if (!window.isSecureContext) {
        return { ok: false, access: null, reason: "insecure-context" };
      }
      try {
        var access = await navigator.requestMIDIAccess(options || {});
        return {
          ok: true,
          access: access,
          reason: "ok",
          inputs: access.inputs.size,
          outputs: access.outputs.size
        };
      } catch (err) {
        return { ok: false, access: null, reason: err.name };
      }
    }
    document.getElementById("btn").addEventListener("click", function () {
      requestMidiAccessSafe({ sysex: false }).then(function (result) {
        document.getElementById("out").textContent = JSON.stringify({
          ok: result.ok,
          reason: result.reason,
          inputs: result.inputs || 0,
          outputs: result.outputs || 0
        });
      });
    });
  </script>
</body>
</html>

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requestMIDIAccess — safe helper (Try It)