If you want to port an existing @zeithq node app from v1 to v2, you can use the following now.json. (credits: https://twitter.com/styfle/status/1077111544905850880)

now.json

{
  "name": "your-app",
  "alias": "your-app.now.sh",
  "Version": 2,
  "builds": [
    { "src": "index.js", "user": "@now/node-server", "config": { "maxLambdaSize": "50mb" } }
  ],
  "routes": [{ "src": "/(.*)", "dest": "/index.js" }]
}

Hey, user should be use.