What Is JavaScript JSON Object

Q

What Is JavaScript JSON Object?

✍: FYIcenter.com

A

The JSON object is a built-in object in the JavaScript engine that offers 2 functions to parse and generate JSON text strings:

1. JSON.parse() - Parses a text string from a JSON text string, constructs the JavaScript value. An optional reviver function can be provided to perform a transformation on the resulting object before it is returned.

2. JSON.stringify() - Converts a JavaScript value to a JSON text string, An optional replacer function is specified to replace some values.

Here is a JavaScript code example, JSON-Hello.html, that shows you how to use the built-in JSON object:

<!-- JSON-Hello.html
     Copyright (c) FYIcenter.com 
-->
<html>
<body>
<script type="text/javascript">
   var object = {"msg":"Hello World!"};
   var str = JSON.stringify(object);

   document.write("<p>JSON text string from JSON.stringify():</p>");
   document.write("<pre>str = "+str+"</pre>");

   var val = JSON.parse(str);
   document.write("<p>Value from JSON.parse():</p>");
   document.write("<pre>val.msg = "+val.msg+"</pre>");
</script>
</body>
</html>

Open this example, JSON-Hello.html, in a Web browser. You see the following:

JSON text string from JSON.stringify():
   str = {"msg":"Hello World!"}

Value from JSON.parse():
   val.msg = Hello World!

⇒ JSON.parse() Function in JavaScript

⇐ Using JSON in JavaScript

⇑ Using JSON in JavaScript

⇑⇑ JSON Tutorials

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(More comments ...)

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How to write a reviver function to transform values while the JSON.parse() function is parsing the JSON text string? Below is a good example on using a reviver function with the JSON.parse() call to transform parsed JSON element values: <!-- JSON-parse-Transformed.html Copyright (c) FYIcenter... 2017-09-08, ∼3181🔥, 0💬

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Call JSON.parse() with Reviver Function
What is a reviver function that you can provide the JSON.parse() function call? The reviver function is an event handler function that is called repeatedly whenever a JSON element is parsed during the execution of the JSON.parse() function. The reviver function must defined with the following signat... 2023-09-07, ∼2674🔥, 0💬

Using JSON in JavaScript
Where to find tutorials on Using JSON in JavaScript? Here is a list of tutorials to answer many frequently asked questions compiled by FYIcenter.com team on Using JSON in JavaScript. What Is JavaScript JSON Object JSON.parse() Function in JavaScript JSON-parse.html - JSON.parse() Example Code JSON-p... 2023-04-13, ∼2574🔥, 0💬

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JSON.parse() Function in JavaScript
Where to get the detailed description of the JSON.parse() Function in JavaScript? Here is the detailed description of the JSON.parse() Function in JavaScript. Description - The JSON.parse() function parses a JSON string, constructing the JavaScript value or object described by the string. An optiona... 2023-04-13, ∼2460🔥, 0💬

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JSON Text String Example
Where to get a simple example of JSON text string? You can go to JSON at Wikipedia to get the following JSON text string example: { "firstName": "John", "lastName": "Smith", "isAlive": true, "age": 25, "address": { "streetAddress": "21 2nd Street", "city": "New York", "state": "NY", "postalCode": "1... 2023-09-07, ∼2335🔥, 0💬

What Is JavaScript JSON Object
What Is JavaScript JSON Object? The JSON object is a built-in object in the JavaScript engine that offers 2 functions to parse and generate JSON text strings: 1. JSON.parse() - Parses a text string from a JSON text string, constructs the JavaScript value. An optional reviver function can be provided... 2023-04-13, ∼2293🔥, 0💬

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