JSON (JavaScript Object Notation) is a lightweight and text-based data-interchange format. Supports with UTF-8 and date-time information in ISO8601 format. It uses string value pairs for storing data.

Basically it is used to transmit data between a browser and a server. When exchanging data between a browser and a server, the data can only be text. JSON is text, and we can convert any JavaScript object into JSON, and send JSON to the server.

Example:

{
   "firstName":"Biswajeet",
   "lastName":"Samal",
   "isAlive":true,
   "age":28,
   "address":{
      "streetAddress":"25 2nd Street",
      "city":"New York",
      "state":"NY",
      "postalCode":"10021-3100"
   },
   "phoneNumbers":[
      {
         "type":"home",
         "number":"212 888-1234"
      },
      {
         "type":"office",
         "number":"646 989-4567"
      },
      {
         "type":"mobile",
         "number":"123 456-7890"
      }
   ],
   "children":[

   ],
   "spouse":null
}

JSON supports following data types:

• string

{"name":"Biswajeet Samal"}

• number

{"age":28}

• object

{
"employee":{ "name":"Biswajeet Samal", "age":28, "city":"London" }
}

• array

{
"employees":[ "Biswajeet", "Abhijeet", "Satyajeet" ]
}

• boolean

{"isAlive":true}

• null

{"spouse":null}