JSON in JavaScript

JSON
bishrul haq
BSc IT , HND IT

• Extended from the javascript
• JSON is a language-independent data format
• Media type is application/json
• extension is .json
2BH | JSON

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1. Always starts and ends with curly brackets { } name and value is
separated by a colon : more than one pair is separated by comma.
2. It is the most common data format used for asynchronous
browser/server communication, largely replacing XML which is
used by AJAX.
3. For arrays put the arrays between [ ].
4. For elements put the values directly separated by commas.
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key/name value pairs
• { "name" : "value" }
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Objects are comma separated
• { "name1" : "value" , "name2" : "value", "name3" : "value"}
Arrays have square brackets with values separated by comma
• { "name" : [ { "name" : "value" }, { "name" : "value" }] }
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In computer science, a data structure is a data organization, management, and storage format that
enables efficient access and modification.
More precisely, a data structure is a collection of data values, the relationships among them, and the
functions or operations that can be applied to the data.
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• Collection of name/value pairs : Think Object format
• Ordered list of values : Think Array format
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Number - double- precision floating-point can be digits, positive or
negative, decimal fractions, exponents.
• {"name": 10}
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String - double-quoted Unicode with backslash escaping
• {"name": "Hello world"}
Boolean - true or false
• {"name": true}
Array - ordered sequence of values uses square brackets. Values are each
separated by a comma. Indexing starts with 0.
• {"name": [{"name1": 1}, "hello", "world"]}
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Object - unordered collection with key:value pairs. Wrapped with curly
brackets {}. Colons to separate key and name. Keys should be strings and have
unique names.
• {"name": {"name1": 1,"name2": 1}}
Null - just empty
• {"name": null}
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JSON is an object which can be used to describe something. Two items with one
value described.
• { "car1": "black", "car2": "blue" }
JSON vs XML
JSON and XML are human readable
formats JSON is faster to write.
XML has not arrays. JSON much easier
to parse in JavaScript
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var detail = {
“firstname“ : “Bishrul",
“lastname" : “Haq",
“age“ : 24 };
Console.log ( detail );
Open up your ide.
Create an object
Output the Object (Try in using
your browser).
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2
1
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Another good advantage of JSON is the ability to pass the value
or data into a JavaScript object.
var o = { foo: "bar" };
{ "foo": "bar" }
• JSON has double quotes while JavaScript can use single or doubles.
• JavaScript can include functions which is not available in JSON.
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Here are some examples for objects in JavaScript:
var haq= {};
haq.car1 = "black"
console.log(haq)
haq.car2 = "blue“
console.log(haq)
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var haq = {};
haq["car1"] = "black“
console.log(haq)
haq["car2"] = "blue“
console.log(haq)
var haq = {"car1" : "black" ,"car2" : "blue"};
console.log(haq)

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Create a JSON file from
this data.
Firstname : bishrul
Lastname : Haq
Age : 24
Address :
streetAddress : 23/1 York Street
city : Badulla
state : Uva
PhoneNumber :
type : home
number : 000 000000
Gender :
type: maleBH | JSON

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You can use both the brackets or dot notations to add or get data.
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var bh= {}
bh.car1 = “black”
bh["car1"] = “blue”
console.log(bh);

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The JSON.stringify() method converts a JavaScript value to a JSON string, optionally
replacing values if a replacer function is specified or optionally including only the specified
properties if a replacer array is specified.
The JSON.parse() method parses a JSON string, constructing the JavaScript value or object
described by the string. An optional reviver function can be provided to perform a
transformation on the resulting object before it is returned.
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var bh = {“firstname” : “Bishrul”, “lastname” : “haq”};
var obj = JSON.parse(json);
console.log(obj);
var bh ={ x: 5, y: 6 };
var obj = JSON.stringify(json);
console.log(obj);

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• Create an object as shown below.
• Output the content in the console.
• Add it to your localhost using JavaScript.
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Person
Firstname : bishrul
Lastname : Haq
Age : 24
Firstname : bishrul
Lastname : Haq
Age : 20

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If you have any questions or suggestions
please connect with me via an email.
info@bishrulhaq.com
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