JSONSocket - Qt JSON parsing and validation

client.cpp

QString Client::ProcessCommand(QScriptValue req)
{
    QScriptValue cmd = req.property("command");
    QString response;

    // Basic sanity check
    if (!cmd.isValid())
    {
        response = CommandErrorResponse("invalid", "No command specified");
    }

    // Process greeting
    else if (cmd.toString() == "greeting")
    {
        QScriptValue message = req.property("message");

        if (!message.isValid())
        {
            response = CommandErrorResponse("greeting", "No message specified");
        }
        else
        {
            response = CommandResponse("greeting", "Hello server. Hope things are well!");
        }
    }
...
}