The Fastify Vite plugin allows developers to run Vite's development server as middleware in a Fastify application, enabling easy integration of Vite applications. It also supports serving the production bundle and includes configuration hooks for routing and customization. Additionally, it links to related packages for Vue and React, providing functionality similar to Nuxt and Next.js.

The article discusses techniques for implementing code reloading in Rack applications, enabling developers to see changes instantly without restarting the server. It covers the benefits of using tools and middleware to streamline the development process and improve efficiency. Additionally, it provides practical examples and configurations for setting up code reloading effectively.