Json is a fast and convenient method to send data to Javascript. JSONhas nearly replaced XML in the last few years due to its simplicity and ease of processing by machines. json data is used to create in realtime and send a database to the clients. Json takes place of xml ,like it easy to read json than xml syntaxes.

1.Number
 Numerical values can be aggregated using any available aggregation function. Using this type of field type, you will be able to aggregate with all available aggregations. The values of this type of field are sorted numerically.
2.Array
 Objects that comprise a collection of JSON objects. The start of the sentence is [ (left bracket) and the end of the sentence is ] (right bracket)
3.Object
 The names/values are listed in an unordered manner in the middle (curly brackets).
4.String
 A string value, which can be aggregated by count and distinct count. Values of this field type are sorted alphabetically. String data contains members of the field. The members will be sorted based on their types
5.Empty/Null
 When there is no value to assign to a key, JSON uses the null value. Key value pairs with no data will be shown as "null" with no quotes.
6.Boolean
 With no quotation marks, a value of true or false. These values can be treated as string values.