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Integration
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 include/nlohmann/json_fwd.hpp for forward-declarations. The installation of json_fwd.hpp (as part of cmake's install step), can be achieved by setting -DJSON_MultipleHeaders=ON.