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Most of new front ends are single page applications based on React, Mobx.
Install package node_modules and add into package.json as dependency.
npm i package-name
Install package node_modules and add into package.json as developer dependency
npm i --save-dev package-name
Install package in particular version
npm i --save-dev package-name@^3.2.1
Uninstall package
npm un package-name
Show version of installed package
npm ls package-name
For semantic versionning see npm documentation