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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.padStart()</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var str = "5";
    document.getElementById("out").textContent = [
      str.padStart(2, "0"),
      "200".padStart(5)
    ].join("\n");
  </script>
</body>
</html>

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String.padStart() — basic padding (Try It)