nuxt.render(req, res)

Type: Function
Arguments:
1. Request
2. Response
Returns: Promise

You can use Nuxt.js as a middleware with nuxt.render for your node.js server.

Example with Express:

const { loadNuxt, build } = require('nuxt')

const app = require('express')()
const isDev = process.env.NODE_ENV !== 'production'
const port = process.env.PORT || 3000

async function start() {
  // We get Nuxt instance
  const nuxt = await loadNuxt(isDev ? 'dev' : 'start')

  // Render every route with Nuxt.js
  app.use(nuxt.render)

  // Build only in dev mode with hot-reloading
  if (isDev) {
    build(nuxt)
  }
  // Listen the server
  app.listen(port, '0.0.0.0')
  console.log('Server listening on `localhost:' + port + '`.')
}

start()

It's recommended to call nuxt.render at the end of your middlewares since it will handle the rendering of your web application and won't call next()

Using Nuxt Programmatically renderRoute