'How to start NodeJS Server when opening website?

my question is: How can i start my server from my website server-folder when its online? I haven't uploaded my server folder so far.

currently, my folder structure is:

public
  - index.html
  - index.css
  - index.js

server
  - server.js

When i open my website, i also want my server to run, so i can make requests to it.

node.js web server

Sources

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