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<!DOCTYPE html>
<html>
<body>
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<h1>Using the <em>reviver</em> Function</h1>
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<p>Uppercase the value of "city":</p>
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<p id="demo"></p>
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<script>
var text = '{ "name":"John", "age":"39", "city":"New York"}';
var obj = JSON.parse(text, function (key, value) {
  if (key == "city") {
    return value.toUpperCase();
  } else {
    return value;
  }
});
document.getElementById("demo").innerHTML = obj.name + ", " + obj.city; 
</script>
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</body>
</html>
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