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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Null-free check</title>
</head>
<body>
  <h1>Validate no null bytes</h1>
  <pre id="out"></pre>
  <script>
    function isNullFree(value) {
      return !/\0/.test(value);
    }
    document.getElementById("out").textContent =
      isNullFree("report.pdf") + "\n" +
      isNullFree("doc\u0000.pdf") + "\n" +
      isNullFree("hello");
  </script>
</body>
</html>

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JavaScript RegExp \0 — null-free validation (Try It)