'How do I deploy a next.js app with a custom backend (express) to a VPS or Heroku

How do I deploy a next.js app with a custom backend (specifically express) to a VPS or Heroku.

Solution 1:^[1]

I have the same setup.

I used this and it works:

 "scripts": {
    "start": "node server.js",
    "heroku-postbuild": "cd client && npm install && npm run build"
  },

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Solution	Source
Solution 1	daninad