how to create and install a npm project code example

Example 1: install node_modules

npm install

Example 2: 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 3: how to install npm modules

npm install packagename