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<!DOCTYPE html>
<html>
<body>
​
<h1>Using the <em>replacer</em> Function</h1>
​
<p>Uppercase the value of "city":</p>
​
<p id="demo"></p>
​
<script>
var obj = { "name":"John", "age":"39", "city":"New York"};
var text = JSON.stringify(obj, function (key, value) {
  if (key == "city") {
    return value.toUpperCase();
  } else {
    return value;
  }
});
​
document.getElementById("demo").innerHTML = text; 
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjson_stringify_replacer by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:02:18 GMT -->
</html>
​
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