rsnext/examples/custom-server-express/package.json

{
  "scripts": {
    "dev": "node server.js",
    "build": "next build",
    "start": "NODE_ENV=production node server.js"
  },
  "dependencies": {
    "express": "^4.14.0",
    "next": "^2.0.0-beta"
  }
}