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ArduinoJSON v6 - Passing buffer as function parameter

I'm new to ArduinoJSON - so perhaps it is a newbie's question.... but I wish to pass a StaticJsonDocument into a function as a parameter ( later on it should be implemented in a library ). exmaple ...
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How to get different parsed JSON data?

In my recent project, I have to parse incoming JSON data in Arduino and I successfully did it. But it is only for one constant data string. For example, if my incoming JSON string like: {"TPS":"0.40"...
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How to pass JsonObject from ArduinoJson to ESP8266WebServer object?

I am learning the ArduinoJson.h library and creating jsonOject: JsonObject& prepareResponse(JsonBuffer& jsonBuffer) { JsonObject& root = jsonBuffer.createObject(); JsonArray& ...