HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>File metadata</title>
  <style>
    body { font-family: system-ui, sans-serif; max-width: 32rem; margin: 2rem auto; padding: 0 1rem; }
    pre { background: #f1f5f9; padding: 1rem; border-radius: 8px; white-space: pre-wrap; }
  </style>
</head>
<body>
  <h1>File metadata</h1>
  <p>Choose any file to inspect its properties.</p>
  <input type="file" id="fileInput">
  <pre id="out">Waiting for a file…</pre>
  <script>
    document.getElementById("fileInput").addEventListener("change", function (event) {
      var file = event.target.files[0];
      var out = document.getElementById("out");
      if (!file) {
        out.textContent = "No file selected.";
        return;
      }
      out.textContent =
        "Name: " + file.name + "\n" +
        "Size: " + file.size + " bytes (" + (file.size / 1024).toFixed(1) + " KB)\n" +
        "Type: " + (file.type || "(empty — check extension)") + "\n" +
        "Last modified: " + new Date(file.lastModified).toLocaleString();
    });
  </script>
</body>
</html>

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JavaScript File Handling — file metadata (Try It)