Writing Nuxt server middlewares

Put simply, server middlewares are server-side apps that are used as middlewares in Nuxt. We have been running our Nuxt apps under a server-side framework such as Koa since Chapter 8, Adding a Server-Side Framework. If you are using Express, this is the scripts object in your package.json file:

// package.json
"scripts": {
  "dev": "cross-env NODE_ENV=development nodemon server/index.js --watch 
   server",
  "build": "nuxt build",
  "start": "cross-env NODE_ENV=production node server/index.js",
  "generate": "nuxt generate"
}

In this npm script, the dev and start scripts instruct the server to run your app from /server/index.js. This might not be ideal as we have coupled Nuxt and the server-side framework tightly, and it results in extra work in the configuration. However, we can tell Nuxt not to attach to the server-side framework's configurations in /server/index...