ArduinoJson 5.4.0

Changes since v5.3.0

• Changed ::String to ArduinoJson::String (issue #275)
• Changed ::Print to ArduinoJson::Print too

Which package to download?

If you are running the official Arduino IDE, download ArduinoJson-v5.4.0.zip.
You can also use the library manager from the IDE; it will download the library for you.

If you are running an alternative IDE (like Energia or Stino), download ArduinoJson-v5.4.0-old-layout.zip.
This package has the legacy library layout that was supported by older versions of the Arduino IDE.