does npm init include all packages from oackage.json code example

Example 1: install an npm package

npm install package-name

To save as a dependency:
npm install package-name --save

Example 2: what is package.json in node

All npm packages contain a file, usually in the project root, called package. json - this file holds various metadata relevant to the project. This file is used to give information to npm that allows it to identify the project as well as handle the project's dependencies.