When reading a json field, is the "get<T>()" needed?

[tawmoto]

Hi,

Reading a json field as string is done like this auto message = json["details"].get<std::string>();
But I see that this works also auto message = json["details"], so do I need to put .get<std::string>() there?
Same question for other types of course: bool, int, vectors.

Thanks

[nlohmann]

operator[] returns references of type json. So message in auto message = json["details"] is json, but in auto message = json["details"].get<std::string>(); is std::string.

[tawmoto]

operator[] returns references of type json. So message in auto message = json["details"] is json, but in auto message = json["details"].get<std::string>(); is std::string.

Thank you for your answer.
Because sometimes I have explicitely std::string message = json["details"] and it works without any problems, also for int is the same.
Is something magical or do you recommend putting everytime the get<T>() there?

I like it without get because is cleaner, but if you recommend putting the get, I will put it, of course.

[nlohmann]

If you skip the get, but have a type other than auto/json, then implicit conversions kick in. They are convenient, but can also be the source of bugs, see https://github.com/nlohmann/json#implicit-conversions.