How to insert "null" value in ArduinoJSON

Just use nullptr:

arduinojson_null_example.cpp

json["myvalue"] = nullptr;

json["myvalue"] = nullptr;

If nullptr is not available, use the equivalent (char*)0:

arduinojson_null_fallback.cpp

json["myvalue"] = (char*)0;

json["myvalue"] = (char*)0;

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