how to install a package in node js code example

Example 1: how to install node modules

npm install -g node-modules

Example 2: install node_modules

npm install

Example 3: 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

Example 4: how to install node_module

ls node_modules

//this command above is typed when you install a new vueJS project and dont have a 'node_modules', then run npm run serve