JSON-stringify-Object.html - JSON.stringify() on Objects
Q
How JSON.stringify() behaves on JavaScript objects?
✍: FYIcenter.com
A
When processing an object, JSON.stringify() behave depending on the type of objects
based on the following rules:
- Boolean, Number, and String objects are converted to the corresponding primitive JSON values during stringification.
- Date objects are converted JSON strings according the ISO standard.
- All other objects are converted JSON objects with their enumerable properties only.
- Functions are removed if inside an object, or converted to "null" if inside an array, or converted to "undefined" if by itself.
- "undefined" are removed if inside an object, or converted to "null" if inside an array, or converted to "undefined" if by itself.
Here is a JavaScript example showing how different types of objects get stringified:
<!-- JSON-stringify-Object.html
Copyright (c) FYIcenter.com
-->
<html>
<body>
<script type="text/javascript">
function myFunc() {
return "Hello!";
}
var myObj = new Object();
myObj.name = "Joe";
Object.defineProperty(myObj, 'age', {value: 1, enumerable: false});
Object.defineProperty(myObj, 'type', {value: 'User', enumerable: true});
var str = null;
document.write("<p>String from JSON.stringify():</p>");
document.write("<pre>");
str = JSON.stringify(new String("false"));
document.write(" String object = "+str+"\n");
str = JSON.stringify(new Boolean(false));
document.write(" Boolean object = "+str+"\n");
str = JSON.stringify(new Date(2006, 0, 2, 15, 4, 5));
document.write(" Date object = "+str+"\n");
str = JSON.stringify(myObj);
document.write(" Object object = "+str+"\n");
str = JSON.stringify(JSON);
document.write(" JSON object = "+str+"\n");
str = JSON.stringify(myFunc);
document.write(" Function object = "+str+"\n");
document.write("</pre>");
</script>
</body>
</html>
Save the above code in a file, JSON-stringify-Object.html, and open it in a Web browser. You see the following output:
String from JSON.stringify():
String object = "false"
Boolean object = false
Date object = "2006-01-02T20:04:05.000Z"
Object object = {"name":"Joe","type":"User"}
JSON object = {}
Function object = undefined
2017-09-08, 1294👍, 0💬
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