Here are the 8 official examples of ArduinoJson. They are available in the "Examples" menu of the Arduino IDE.
This example shows how to generate a JSON document with the ArduinoJson library.
JSON HTTP Client
This example shows how to parse a JSON document in an HTTP response. It uses the Ethernet library, but can be easily adapted for Wifi.
JSON UDP Beacon
This example shows how to send a JSON document to a UDP socket. It uses the Ethernet library but could easily be changed to support Wifi.
JSON HTTP Server
This example shows how to implement an HTTP server that sends JSON document in the responses.
JSON Configuration File
This example shows how to store your project configuration in a file. It uses the SD library but can be easily modified for any other file-system.
String objects and ArduinoJson
This example shows the different ways you can use
String objects with ArduinoJson.