HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>keydown log code</title>
</head>
<body>
  <input placeholder="Click here, then press down a key." size="40">
  <p id="log"></p>
  <script>
    var input = document.querySelector("input");
    var log = document.getElementById("log");
    input.addEventListener("keydown", logKey);
    function logKey(e) {
      log.textContent += " " + e.code;
    }
  </script>
</body>
</html>

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Element keydown — log code (Try It)