NPM version

npm -v || npm --version

For help

npm || npm help

Creating package.json

npm init

Creating package.json with Default values

npm init --yes

Set default author

npm config set init-author-name "vishal ibitwar"

Set default License (while setting config is optional)

npm set init-license "MIT"

Check default values (here is author)

npm get init-author-name

Remove Default

npm config delete init-author-name

Install package and save as dependencies

npm install $package_name   --save

Install package and save as dev-dependencies

npm install $package_name   --save-dev

npm install --save-dev   $package_name

Install all dependencies (Regular as well as Dev)

npm install

Install only Regular dependencies

npm install --production

UnInstall package (dev-dependencies || regular dependencies)

npm uninstall $package_name --save-dev

npm un $package_name --save

npm remove $package_name --save

npm rm $package_name --save-dev

Install particular version

npm install $package_name@version

e.g. npm install loadash@4.17.3

Update package

npm update $package_name

              major version can break the application
              minor version will not break the application
              Patch version will fixes the bugs can't break the application
                
4.3.6  will download the exact version
           
^4.3.6  will download the latest minor version
     
~4.3.6  will download the latest patch version
       
* will download the absolute latest major version
          

Install package Globally

npm install -g $package_name

To see where our global package installed

npm root -g

UnInstall globally installed package

npm remove -g $package_name

List the packages in the folder

npm list

List the package in the folder with depth-0

npm list --depth 0 (you can change depth as you want)