npm install package globally

npm install npm@latest -g

npm install --save-dev package
# example:
npm install --save-dev nodemon

npm install package-name -g

#Syntex
npm install packagename -g

#example
npm install express -g

#how to install any specific package in nodejs Application
# Syntex
npm install packagename

# example:
npm install express
npm i express

#if you install globally then type 
npm install express -g

npm install packagename

npm i -g <package>