JsonCpp

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Json::Value root;   // 'root' will contain the root value after parsing. 
std::cin >> root; 
// You can also read into a particular sub-value. 
std::cin >> root["subtree"]; 
// Get the value of the member of root named 'encoding', 
// and return 'UTF-8' if there is no such member. 
std::string encoding = root.get("encoding", "UTF-8" ).asString(); 
// Get the value of the member of root named 'plug-ins'; return a 'null' value if 
// there is no such member. 
const Json::Value plugins = root["plug-ins"]; 
// Iterate over the sequence elements. 
for ( int index = 0; index < plugins.size(); ++index ) 
   loadPlugIn( plugins[index].asString() ); 
    
// Try other datatypes. Some are auto-convertible to others. 
foo::setIndentLength( root["indent"].get("length", 3).asInt() ); 
foo::setIndentUseSpace( root["indent"].get("use_space", true).asBool() ); 
// Since Json::Value has an implicit constructor for all value types, it is not 
// necessary to explicitly construct the Json::Value object. 
root["encoding"] = foo::getCurrentEncoding(); 
root["indent"]["length"] = foo::getCurrentIndentLength(); 
root["indent"]["use_space"] = foo::getCurrentIndentUseSpace(); 
// If you like the defaults, you can insert directly into a stream. 
std::cout << root; 
// Of course, you can write to `std::ostringstream` if you prefer. 
// If desired, remember to add a linefeed and flush. 
std::cout << std::endl;

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{ 
    "encoding" : "UTF-8", 
    "plug-ins" : [ 
        "python", 
        "c++", 
        "ruby" 
        ], 
    "indent" : { "length" : 3, "use_space": true } 
}