Changes to Dropbox's original version

• Removed std::smart_ptr and virtual functions.
• Renamed Json to Value, Json::object to Object, Json::array to Array, Json::dump to Value::to_string, Json::parse to parse.
• Made json object and serialization header file only. (parser is still in .cpp)
• Added append() for arrays and non-const reference operator [].

json11

json11 is a tiny JSON library for C++11, providing JSON parsing and serialization.

The core object provided by the library is json11::Value. A Json object represents any JSON value: null, bool, number (int or double), string (std::string), array (std::vector), or object (std::map).

Json objects act like values. They can be assigned, copied, moved, compared for equality or order, and so on. There are also helper methods json11::Value::to_string, to serialize a Json to a string, and json11::parse (static) to parse a std::string as a Json object.

It's easy to make a JSON object with C++11's new initializer syntax:

json11::Value my_json = json11::Object {
    { "key1", "value1" },
    { "key2", false },
    { "key3", json11::Array { 1, 2, 3 } },
};
std::string json_str = my_json.to_string();

There are also implicit constructors that allow standard and user-defined types to be automatically converted to JSON. For example:

class Point {
public:
    int x;
    int y;
    Point (int x, int y) : x(x), y(y) {}
    json11::Value to_json() const { return json11::Array { x, y }; }
};

std::vector<Point> points = { { 1, 2 }, { 10, 20 }, { 100, 200 } };
std::string points_json = json11::Value(points).to_string();

JSON values can have their values queried and inspected:

json11::Value json = json11::Array { json11::Object { { "k", "v" } } };
std::string str = json[0]["k"].string_value();

More documentation is still to come. For now, see json11.hpp.