boost::json How to serialize to file (std::ofstream) minimal example

#include <boost/json.hpp>
#include <fstream>
#include <iostream>

namespace json = boost::json;

int main() {
    // Create a JSON object
    json::object obj{
        {"name", "John Doe"},
        {"age", 30},
        {"city", "New York"}
    };

    // Open the output file stream
    std::ofstream file("output.json");
    if (file.is_open()) {
        // Serialize the JSON object and write it to the file
        file << obj;

        // Close the file stream
        file.close();
        std::cout << "JSON object serialized and written to file successfully." << std::endl;
    } else {
        std::cout << "Unable to open file for writing." << std::endl;
    }

    return 0;
}

Compile using:

g++ -o main main.cpp -lboost_json

After running the program using ./main, output.json will look this this:

{"name":"John Doe","age":30,"city":"New York"}