modules/

It is a good place to place any local modules you develop while building your application.

The auto-registered files patterns are:

modules/*/index.ts
modules/*.ts

You don't need to add those local modules to your nuxt.config.ts separately.

// `nuxt/kit` is a helper subpath import you can use when defining local modules// that means you do not need to add `@nuxt/kit` to your project's dependenciesimport { createResolver, defineNuxtModule, addServerHandler } from 'nuxt/kit'export default defineNuxtModule({  meta: {    name: 'hello'  },  setup () {    const { resolve } = createResolver(import.meta.url)    // Add an API route    addServerHandler({      route: '/api/hello',      handler: resolve('./runtime/api-route')    })  }})

When starting Nuxt, the hello module will be registered and the /api/hello route will be available.

Local modules are registered in alphabetical order. You can change the order by adding a number to the front of each directory name:

Directory structure

modules/  1.first-module/    index.ts  2.second-module.ts

Read more in Docs > Guide > Going Further > Modules.

middleware

Nuxt provides middleware to run code before navigating to a particular route.

node_modules

The package manager stores the dependencies of your project in the node_modules/ directory.