Here are the eight official examples of ArduinoJson. They are available in the “Examples” menu of the Arduino IDE.

JsonParserExample.ino
This example shows how to deserialize a JSON document with ArduinoJson.
JsonGeneratorExample.ino
This example shows how to generate a JSON document with the ArduinoJson library.
JsonHttpClient.ino
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.
JsonUdpBeacon.ino
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.
JsonServer.ino
This example shows how to implement an HTTP server that sends JSON document in the responses.
JsonConfigFile.ino
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.
StringExample.ino
This example shows the different ways you can use String objects with ArduinoJson.
ProgmemExample.ino
This example shows the different ways you can use Flash strings with ArduinoJson.