Check if a key exists

[tawmoto]

Hi,

Is there a method to check if a key exists? Other than using .at() and catching the exception?
Sometimes I get a field named error in the json response and I would like to check it also.

Thanks.

[nlohmann]

There is a contains(key) member function.

[tawmoto]

contains(key)

Great, I don't know how I missed it. I was searching for "exists" or smth. :-)
Thanks a lot!