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how to install any package in node.js

#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

install package in node js project

Add the package with version user the dependencies and run command in 
  command prompt 
  	npm install (enter)
Eg:
"dependencies": {
    "http": "^0.0.1-security"
  	"https": "1.0.0"
  }