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

2023-04-13, ∼3078🔥, 0💬

💬 2024-10-19 Just Testing: " AND 1=1;SELECT * FROM v$version

💬 2024-10-19 Shika Noko: " AND 1=1;SELECT * FROM " AND 1=1;SELECT * FROM information_schema.tables

💬 2024-10-11 rama: {"name": "Joe", "age": 24, }

(More comments ...)

JSON-parse-Transformed.html - JSON.parse() Value Transformed
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, ∼3925🔥, 0💬

JSON Format Syntax
What is the JSON format syntax? I heard that it is very simple. JSON format syntax is very simple. It can be summarized below: 1. A JSON text string contains a single JSON Value. 2. A single JSON Value must be one of the following: JSON String - A quoted sequence of Unicode characters represented as... 2023-04-13, ∼3916🔥, 0💬

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, ∼3575🔥, 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, ∼3378🔥, 0💬

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, ∼3267🔥, 0💬

What Is JSON?
What Is JSON? JSON (JavaScript Object Notation) is a standard text string format that uses human-readable text to record data objects consisting of attribute–value pairs and array structures. JSON was specified by Douglas Crockfor in in the early 2000s. It was originally derived from JavaScript, but... 2023-04-25, ∼3196🔥, 0💬

JSON-parse-Error.html - JSON.parse() Errors
How to catch errors when calling the JSON.parse() function in JavaScript? If you want to catch errors when calling the JSON.parse() function in JavaScript, you can follow this tutorial: 1. Use the "try {...} catch {...}" block to catch the error object throw from the JSON.parse() function, as shown ... 2023-09-07, ∼3176🔥, 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, ∼3079🔥, 0💬

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, ∼2868🔥, 0💬

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