JSON - Day 26

JSON stands for JavaScript Object Notation. JSON objects are used for transferring data between server and client, XML serves the same purpose. However JSON objects have several advantages over XML  These are in text style.

Features of JSON:

• It is light-weight
• It is language independent
• Easy to read and write
• Text based, human readable data exchange format

Sending Data to Server

var person ={ "name":"Parathan", "age": 19, "place" :"Jaffna"};
var myJSON= JSON.stringify(person);

Receiving Data from Server

var myJSON= { "name":"Parathan", "age": 19, "place" :"Jaffna"};
var person = JSON.parse(myJSON);

Storing Data

var person ={ "name":"Parathan", "age": 19, "place" :"Jaffna"};
var myJSON= JSON.stringify(person);
localStorage.setItem("textJSON", myJSON);

Retrieving Data

text= localStorage.getItem("testJSON")
obj = JSON.parse(text);
document.getElementById("demo").innerHTML = obj.name;


Why use JSON?
Standard Structure: As we have seen so far that JSON objects are having a standard structure that makes developers job easy to read and write code, because they know what to expect from JSON.

Light weight: When working with AJAX, it is important to load the data quickly and asynchronously without requesting the page re-load. Since JSON is light weighted, it becomes easier to get and load the requested data quickly.

Scalable: JSON is language independent, which means it can work well with most of the modern programming language. Let’s say if we need to change the server side language, in that case it would be easier for us to go ahead with that change as JSON structure is same for all the languages.

JSON data structure types and how to read them:

• JSON objects
• JSON objects in array
• Nesting of JSON objects

JSON & JavaScript:
JSON is considered as a subset of JavaScript but that does not mean that JSON cannot be used with other languages. In fact it works well with PHP, Perl, Python, Ruby, Java, Ajax and many more.

Just to demonstrate how JSON can be used along with JavaScript, here is an example:
If you have gone though the above tutorial, you are familiar with the JSON structures. A JSON file type is .json