Retrieval using JSON 

Using the SELECT command to return JSON data.

In Cassandra 2.2 and later, you can use CQL SELECT keywords to retrieve data from a table in the JSON format. For more information, see What's New in Cassandra 2.2: JSON Support.

Retrieving all results in the JSON format 

To get this result, insert the JSON keyword between the SELECT command and the data specifications. For example, :
cqlsh:cycling> select json name, checkin_id, timestamp from checkin;
 {"name": "BRAND", "checkin_id": "50554d6e-29bb-11e5-b345-feff8194dc9f", "timestamp": "2016-08-28 21:45:10.406Z"}
  {"name": "VOSS", "checkin_id": "50554d6e-29bb-11e5-b345-feff819cdc9f", "timestamp": "2016-08-28 21:44:04.113Z"}
(2 rows)

Retrieving selected columns in JSON format 

To specify the JSON format for a selected column, enclose its name in toJson(). For example:
cqlsh:cycling> select name, checkin_id, toJson(timestamp) from checkin;

 name  | checkin_id                           | system.tojson(timestamp)
 BRAND | 50554d6e-29bb-11e5-b345-feff8194dc9f | "2016-08-28 21:45:10.406Z"
  VOSS | 50554d6e-29bb-11e5-b345-feff819cdc9f | "2016-08-28 21:44:04.113Z"

Note: Cassandra2.2 and later return a JSON-formatted timestamp with complete time zone information.