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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>JSON data types — typeof</title>
</head>
<body>
  <h1>Check types</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var data = {
        name: "Ada",
        age: 36,
        active: true,
        skills: ["math"],
        address: { city: "London" },
        nickname: null
      };

      document.getElementById("out").textContent = [
        typeof data.name,
        typeof data.age,
        typeof data.active,
        Array.isArray(data.skills),
        typeof data.address,
        data.nickname === null
      ].join("\n");
    })();
  </script>
</body>
</html>

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JSON Data Types — typeof checks (Try It)