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How to iterate JSON array in C++ using Boost.JSON

You can use a standard for iteration loon on j.as_array() in order to iterate all values in the given JSON array:

iterate_json_array.cpp
for (auto& value : json.as_array()) {
    std::cout << value.as_int64() << std::endl;
}

Full example:

json_example.cpp
#include <boost/json.hpp>
#include <iostream>

int main()
{
    const char* json_str = R"([1, 2, 3, 4, 5])";
    boost::json::value j = boost::json::parse(json_str);

    if (j.is_array()) {
        for (auto& value : j.as_array()) {
            std::cout << value.as_int64() << std::endl;
        }
    }

    return 0;
}

Compile using

compile_json.sh
g++ -o json json.cpp -lboost_json

This will print

example.txt
1
2
3
4
5
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