JsonObject myJson; myJson["name"] = "John"; myJson["age"] = 30; if(myJson.containsKey("name")){ cout<<"Name exists"<
Output: 'Name exists'
Example 2: Here, we can use the same JsonObject 'myJson' from Example 1, but this time we will check for a key that does not exist in the object.if(myJson.containsKey("address")){ cout<<"Address exists"<Output: 'Address does not exist' The code examples above are written using the ArduinoJson library for C++. This library is used for parsing and generating JSON data, and is designed to be easy to use and memory-efficient.