If you currently have a server running with Node 12, your most likely are going to want to update to Node 14 which is a newer version.
This guide will help you to easily upgrade from Node 12 to Node 14.
Next, run the following commands:
curl --silent --location https://deb.nodesource.com/setup_14.x | bash - apt update apt install -y nodejs
After this has completed, run the following command to verify the version you currently have:
It should output anything in the lines of:
This means you're currently running Node on version 14.