Is there a method to create nested json other than crow::json::load( string )

[YumingChang02]

i hope to create nested json from a unordered_map of string -> struct( int start, int end ) to json response such as { "test1":{ "start":10, "end":20 }, "test2":{ "start":20, "end":50 } } Currently i could make this by concating my unordered_map elements to json formed std::string, then load with crow::json::load. Is there any methods other than concat strings?

[kiner-shah]

Yes, you can use crow::json::wvalue::object for this.

#include "crow.h"
#include <unordered_map>
#include <iostream>

struct StartEnd
{
    int start, end;
};

int main()
{
    std::unordered_map < std::string, StartEnd > m{ {"test1", {10, 20}}, {"test2", {20, 50}} };
    crow::json::wvalue::object input;
    for (const auto& p : m)
    {
        const auto& key = p.first;
        const auto& start = p.second.start;
        const auto& end = p.second.end;

        crow::json::wvalue value{
            {"start", start},
            {"end", end}
        };
        input.insert({key, value});
    }

    crow::json::wvalue response{ input };
    std::cout << response.dump() << '\n';

    return 0;
}