HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>active — stop tracks</title>
</head>
<body>
  <button id="run">Run demo</button>
  <pre id="out">Click Run (allow mic if prompted).</pre>
  <script>
    document.getElementById("run").addEventListener("click", function () {
      var out = document.getElementById("out");
      if (!window.isSecureContext || !navigator.mediaDevices) {
        out.textContent = "Need secure context + mediaDevices.";
        return;
      }
      navigator.mediaDevices
        .getUserMedia({ audio: true })
        .then(function (stream) {
          var before = stream.active;
          stream.getTracks().forEach(function (track) {
            track.stop();
          });
          var after = stream.active;
          out.textContent = "before: " + before + "\nafter: " + after;
        })
        .catch(function (err) {
          out.textContent = "Error: " + err.message;
        });
    });
  </script>
</body>
</html>

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MediaStream.active — stop all tracks (Try It)