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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>JSON _comment key</title>
</head>
<body>
  <h1>_comment as data</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var data = {
        _comment: "Demo user",
        name: "Ada",
        id: 1
      };

      document.getElementById("out").textContent =
        data.name + "\n" + data._comment;
    })();
  </script>
</body>
</html>

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JSON Comments — _comment key (Try It)