The most basic way to create a chatbot using JavaScript is to use a library called ChatScript, which has been around since 2006 and allows you to create simple bots without any coding knowledge required. If you want something more advanced than this, several other options are available, such as:
BotEngine – a framework for building chatbots in NodeJS.
DialogFlow – Google’s own conversational AI platform.
Wit – an open-source project from Facebook dedicated to making chatbots smarter.