Baic knowledge for package.json

In this article, I would like to share basic knowledge for package.json

🍮 Restrict Node version

If you want to keep node.js version in your project, please write following configuration in package.json:

"engines" : { "node" : ">=8.9.4" }

If you use nvm and you put .nvmrc, you can use specific version of node.js.

🚜 License for private product

For preventing publishing the product to npm libraries, please set "license": "UNLICENSED" and "private": true:

"license": "UNLICENSED",
"private": true

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