Botkit send middleware to do things like preprocess the message content before it gets sent

botkit_send_middleware.js

// From https://github.com/howdyai/botkit#send-middleware
controller.middleware.send.use(function(bot, message, next) {

    // do something useful...
    if (message.intent == 'hi') {
        message.text = 'Hello!!!';
    }
    next();

});