server.js

// New Relic
require("newrelic")
// Modules
const express = require("express")
const { existsSync } = require("fs")
const { resolve } = require("path")
const { Nuxt } = require("nuxt")

const options = require("./nuxt.config")
// Force production mode (no webpack middleware called)
options.dev = false

// Start Nuxt.js
const nuxt = new Nuxt(options)
// Check if project is built for production
const distDir = resolve(
  nuxt.options.rootDir,
  nuxt.options.buildDir || ".nuxt",
  "dist"
)

if (!existsSync(distDir)) {
  console.error(
    "> No build files found, please run `nuxt build` before launching `npm start`"
  ) // eslint-disable-line no-console
  process.exit(1)
}

const port = process.env.PORT || process.env.npm_package_config_nuxt_port
const host = process.env.HOST || process.env.npm_package_config_nuxt_host

nuxt.listen(port, host)