npm is the package manager for JavaScript.
Install Node.js on your machine.
npm init - create package.json file initating a command line questionnaire
npm init --yes or npm init -y - create a package.json file and fill in default values
npm ls -g --depth=0 - list out global installed packages
npm uninstall -g [<name> [<name ...]] - uninstall global package(s)
npm outdated --global - check for outdated global installed packages
npm list or npm ls (preferred shorthand) - list out currently installed npm packages
npm ls --depth=0 - only draws out the top of the dependency tree
npm install - will install both "dependencies" and "devDependencies"
npm install --production - will only install "dependencies"
npm install --dev - will only install "devDependencies"
npm outdated - check for outdated packages
npm prune [<name> [<name ...]] - removes "extraneous" packages
npm where - show npm installed path
npm cache clean - clean npm cache
npm run-script <script-name> or for short npm run <script-name> - run scripts from package.json