nlohmannjson/doc/examples/from_msgpack.cpp

#include <iostream>
#include <iomanip>
#include <nlohmann/json.hpp>

using json = nlohmann::json;

int main()
{
    // create byte vector
    std::vector<uint8_t> v = {0x82, 0xa7, 0x63, 0x6f, 0x6d, 0x70, 0x61, 0x63,
                              0x74, 0xc3, 0xa6, 0x73, 0x63, 0x68, 0x65, 0x6d,
                              0x61, 0x00
                             };

    // deserialize it with MessagePack
    json j = json::from_msgpack(v);

    // print the deserialized JSON value
    std::cout << std::setw(2) << j << std::endl;
}