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Alternatively, you could use the DigitalOcean App Platform which will automate your future deployments too and you would not have to do any server-side configuration:
Hello,
I could suggest two options here:
You can find all of the commands from that video here:
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-node-js-application-for-production-on-ubuntu-20-04
https://docs.digitalocean.com/products/app-platform/languages-frameworks/nodejs/
Hope that this helps!
Regards,
Bobby