node.js - What is the difference between --save and --save-dev?

What is the difference between:

npm install [package_name] --save

and

npm install [package_name] --save-dev

What does this mean?

Answer

• --save-dev is used to save the package for development purpose.
  Example: unit tests, minification..



• --save is used to save the
  package required for the application to run.