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<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, 21 Dec 2022 17:39:11 GMT --></html>