C++26 Struct To JSON Parser using C++ Reflection

Requirements

• Only compiled and tested on GCC 16.1 with -freflection flag.

Features

• Automatic json serialization from a C++ struct/class.
• Supports enum to string.
• Supports inheritance.
• Supports some STL libraries, namely...
  • std::string/string_view
  • std::array
  • std::vector
  • std::set/unordered_set
  • std::map/unordered_map
  • std::unique_ptr
  • std::pair/tuple
  • std::optional
  • std::variant

Sample Usage

#include "json_parser.hpp"

#include <string>
#include <print>

struct Foo
{
    int i = 1;
    float f = 3.1415f;
    bool b = true;
    std::string s = "Hello World";
};

int main()
{
    std::println("{}", parse_json(Foo{}));

    // Output: {"i": 1, "f": 3.1415, "b": true, "s": "Hello World"}
}

Remarks

• This parser is written as a form of practice.
• Please take a look at glaze for a proper C++26 reflection based JSON serialization library.