json.hpp is the single required file in
single_include/nlohmann or released here. You need to add
#include <nlohmann/json.hpp> // for convenience using json = nlohmann::json;
to the files you want to process JSON and set the necessary switches to enable C++11 (e.g.,
-std=c++11 for GCC and Clang).
You can further use file
single_include/nlohmann/json_fwd.hpp for forward declarations.
Last update: March 8, 2023