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JSON or JavaScript Object Notation is a lightweight text-based open standard designed for human-readable data interchange. Conventions used by JSON are known to programmers, which include C, C++, Java, Python, Perl, etc.
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JSON stands for JavaScript Object Notation.
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The format was specified by Douglas Crockford.
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It was designed for human-readable data interchange.
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It has been extended from the JavaScript scripting language.
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The filename extension is .json.
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JSON Internet Media type is application/json.
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The Uniform Type Identifier is public.json.
Uses of JSON
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It is used while writing JavaScript based applications that includes browser extensions and websites.
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JSON format is used for serializing and transmitting structured data over network connection.
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It is primarily used to transmit data between a server and web applications.
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Web services and APIs use JSON format to provide public data.
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It can be used with modern programming languages.
Characteristics of JSON
- JSON is easy to read and write.
- It is a lightweight text-based interchange format.
- JSON is language independent.
Simple Example in JSON
The following example shows how to use JSON to store information related to books based on their topic and edition.
{
"book": [
{
"id":"01",
"language": "Java",
"edition": "third",
"author": "Herbert Schildt"
},
{
"id":"07",
"language": "C++",
"edition": "second",
"author": "E.Balagurusamy"
}
]
}
After understanding the above program, we will try another example. Let”s save the below code as json.htm −
<html>
<head>
<title>JSON example</title>
<script language = "javascript" >
var object1 = { "language" : "Java", "author" : "herbert schildt" };
document.write("<h1>JSON with JavaScript example</h1>");
document.write("<br>");
document.write("<h3>Language = " + object1.language+"</h3>");
document.write("<h3>Author = " + object1.author+"</h3>");
var object2 = { "language" : "C++", "author" : "E-Balagurusamy" };
document.write("<br>");
document.write("<h3>Language = " + object2.language+"</h3>");
document.write("<h3>Author = " + object2.author+"</h3>");
document.write("<hr />");
document.write(object2.language + " programming language can be studied " + "from book written by " + object2.author);
document.write("<hr />");
</script>
</head>
<body>
</body>
</html>
Now let”s try to open json.htm using IE or any other javascript enabled browser that produces the following result −
You can refer to JSON Objects chapter for more information on JSON objects.
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