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<p>JavaScript Object Notation (JSON) is a text format for the serialization of structured data.</p>
<p>It is derived from the object literals of JavaScript.</p>
<p>JSON can represent four <strong>primitive types</strong> (strings, numbers, booleans, and null) and two <strong>structured types</strong> (objects and arrays)</p>
<h1>Primitive JSON</h1>
<p>Here are four small JSON texts containing only values:<br>
"Hello world!"<br>
42<br>
true<br>
null
</p>
<h1>Object JSON</h1>
<p>An object structure is represented as a pair of curly brackets surrounding zero or more name/value pairs (or members).</p>
<p>An object is an unordered collection of zero or more name/value pairs</p>
<p>A <strong>name</strong> is a string</p>
<p>A <strong>value</strong> is a string, number, boolean, null, object, or array.</p>
<p>Declare properties using <strong>name:value</strong> pairings separated by commas</p>
<p>Enclose names in curly braces</p>
<p>There is no trailing comma</p>
<p>This is a JSON object:</p>
<pre>
{
"Image": {
"Width": 800,
"Height": 600,
"Title": "View from 15th Floor",
"Thumbnail": {
"Url": "http://www.example.com/image/481989943",
"Height": 125,
"Width": 100
},
"Animated" : false,
"IDs": [116, 943, 234, 38793]
}
}
</pre>
<h1>Array JSON</h1>
<p>An array structure is represented as square brackets surrounding zero or more values (or elements).</p>
<p>Elements are separated by commas.</p>
<p>A <strong>value</strong> must be an
<ul>
<li>object</li>
<li>array</li>
<li>number</li>
<li>string</li>
<li>three literal names
<ol>
<li>true</li>
<li>false</li>
<li>null</li>
</ol>
</li>
</ul>
<p>This is a JSON array containing two objects:</p>
<pre>
[
{
"precision": "zip",
"Latitude": 37.7668,
"Longitude": -122.3959,
"Address": "",
"City": "SAN FRANCISCO",
"State": "CA",
"Zip": "94107",
"Country": "US"
},
{
"precision": "zip",
"Latitude": 37.371991,
"Longitude": -122.026020,
"Address": "",
"City": "SUNNYVALE",
"State": "CA",
"Zip": "94085",
"Country": "US"
}
]
</pre>
<h1>Number</h1>
<p>The representation of numbers is similar to that used in most programming languages. A number is represented in base 10 using decimal digits. It contains an integer component that may be prefixed with an optional minus sign, which may be followed by a fraction part and/or an exponent part. Leading zeros are not allowed. A fraction part is a decimal point followed by one or more digits.</p>
<h1>String</h1>
<p>The representation of strings is similar to conventions used in the C family of programming languages. A string begins and ends with quotation marks.</p>
<p><a href="https://tools.ietf.org/html/rfc7159">source: The Internet Engineering Task Force (IETF)</a></p>
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