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<head>
  <meta charset="utf-8">
  <title>JSON.parse — error</title>
</head>
<body>
  <h1>Catch SyntaxError</h1>
  <pre id="out"></pre>
  <script>
    (function () {
      var bad = "{ name: 'Ada', }";
      var lines = [];

      try {
        lines.push(String(JSON.parse(bad)));
      } catch (err) {
        lines.push(err.name);
        lines.push("Could not parse JSON");
      }

      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JSON.parse() — SyntaxError (Try It)