JSON

JSON is Javascript object notation . this is also a part of my learning . bcoz Its a popular data interchange format between clients and servers. 

Json is basically a lightweight data interchange format. earlier we used to with XML and HTML and many more .But Json is lightweight , Easy to understand , language independent and self describing.

As we know that Server cannot send any object directly to client . so it need any middleware which can understandable both the side  so through Json, server send any query as a string type and on client side it can easily be parsed as Object .So basically in laymen language json is a string , which can be easily converted into object and also object to string.

lets take a example. 

1.)

{
"student": [
{ "firstName":"tom" , "lastName":"decker" }, 
{ "firstName":"varun" , "lastName":"jain" }, 
{ "firstName":"lexia" , "lastName":"woodhouse" }
]

} 

2.)

'{
"employees": [{ "firstName":"John" , "lastName":"Doe" }, { "firstName":"Anna" , "lastName":"Smith" }, { "firstName":"Peter" , "lastName":"Jones" }]}'

so you can see how both look similar but First one is object and Second one is String. 

so object to string and string to object . 

JSON.stringify(data);  - this convert into string format.

JSON.parse(data);      - this convert into javascript object .