how does npm work code example

Example 1: what is npm

npm is a package manager for the JavaScript programming language.

It is the default package manager for the JavaScript runtime environment Node.js

It consists of a command line client, also called npm, and an online database
of public and paid-for private packages, called the npm registry.

Example 2: what is npm install

npm install module-name
npm i module-name
puts module-name package (js library file) 
into node_modules folder
so you can require it in node app

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