JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write, and easy for machines to parse and generate. It is based on a subset of the JavaScript programming language and is commonly used to send data between a server and web application. JSON is composed of two structures: a collection of name/value pairs and an ordered list of values. Each name is followed by ':' (colon), the name/value pairs are separated by , (comma). The elements in the ordered list are enclosed within square brackets [ ].

Here is an example of a JSON object:

json
 
 
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{  
   "firstName":"John",
   "lastName":"Smith",
   "age":25,
   "address":{  
      "streetAddress":"21 2nd Street",
      "city":"New York",
      "state":"NY",
      "postalCode":"10021"
   },
   "phoneNumbers":[  
      {  
         "type":"home",
         "number":"212 555-1234"
      },
      {  
         "type":"fax",
         "number":"646 555-4567"
      }
   ]
}