rapidjson/example/simplewriter/simplewriter.cpp

#include "rapidjson/writer.h"
#include "rapidjson/stringbuffer.h"
#include <iostream>

using namespace rapidjson;
using namespace std;

int main() {
    StringBuffer s;
    Writer<StringBuffer> writer(s);
    
    writer.StartObject();   // writer expects subsequent key/value pairs.
    writer.String("hello"); // key
    writer.String("world"); // value
    writer.String("t");     // key
    writer.Bool(true);      // value
    writer.String("f");     // etc...
    writer.Bool(false);
    writer.String("n");
    writer.Null();
    writer.String("i");
    writer.Uint(123);
    writer.String("pi");
    writer.Double(3.1416);
    writer.String("a");
    writer.StartArray();
    for (unsigned i = 0; i < 4; i++)
        writer.Uint(i);
    writer.EndArray();
    writer.EndObject();

    // {"hello":"world","t":true,"f":false,"n":null,"i":123,"pi":3.1416,"a":[0,1,2,3]}
    cout << s.GetString() << endl;

    return 0;
}