Procedure
Install Node.js with fnm on macOS or Linux
Install fnm (Fast Node Manager), load it in the shell, install and use an LTS Node.js release, then verify with node and npm version commands.
Step 1
Ensure curl and unzip are installed. On macOS/Linux install fnm per https://github.com/Schniz/fnm : curl -fsSL https://fnm.vercel.app/install | bash (on macOS you can instead: brew install fnm). Open a new shell so PATH picks up fnm.
Step 2
If node is not found yet, evaluate fnm in this shell: eval "$(fnm env)". Then: fnm install --lts && fnm use --lts
Step 3
node --version && npm --version
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