• https://docs.npmjs.com/getting-started/fixing-npm-permissions

Install global npm:

  dnf install nodejs
  
  zypper in nodejs10
  

Make a directory for global installations:

mkdir ~/.npm-global

Configure npm to use the new directory path:

npm config set prefix '~/.npm-global'

cat ~/.npmrc 
prefix=~/.npm-global

Open or create a ~/.profile file and add this line:

export PATH=~/.npm-global/bin:$PATH

Back on the command line, update your system variables:

source ~/.profile

Navigate to the directory in which you want your project to exist – in my case, sites/node-test.

cd sites/node-test

Now initalize a new project with npm.

npm init

The following will pop up in the terminal, and prompt you for a few

This utility will walk you through creating a package.json file.
It only covers the most common items, and tries to guess sensible defaults.

See `npm help json` for definitive documentation on these fields
and exactly what they do.

Use `npm install ` afterwards to install a package and
save it as a dependency in the package.json file.

  npm install dependency-name-here
  

add –save, –save-dev. The dependency will be written to package.json

Install all deps

  npm install