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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>atob() — safe decode</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    function safeAtob(input) {
      try {
        return atob(input);
      } catch (error) {
        return "Error: " + error.message;
      }
    }
    document.getElementById("out").textContent = [
      safeAtob("SGVsbG8="),
      safeAtob("not!!!valid")
    ].join("\n");
  </script>
</body>
</html>

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JavaScript Window atob() — safe decode (Try It)