I am using node.js and I want to give my users the ability to add their own custom domains.
For example, my app is hosted on DigitalOcean with the domain ‘https://app.com’ and the user, let's say, John, his page is ‘https://app.com/john’
Now I want my user, John, to be able to add his own domain ‘www.john.com’ so that it displays ‘https://app.com/john’ site.