How can I pass value from C/AL type into JSON?

Hello all,
I have external assembley that has Json ustring data. I have to pass value between Json .NET type and C/AL type?
Are below converts are same?
1. Json .NET into C/AL
C/AL into Json .NET

2. std::string into std::wstring
std::wstring into std::string

How can I pass value between Json and C/AL?

Regards,
Undy