NPM Module - How to leverage the package.json file?

I'm writing a NPM module for a cli-based tool. After someone installs the package, I need to read their package.json file. I know how to read the file in syntax. My question is, how can I consistenly retrieve the package.json file and should I use relative or absolute paths.

So, after installing, my code would reside somewhere inside the node_modules folder:

package.json // I need to require this file
node_modules/
  ↳ my-package/
    ↳ dist/
      ↳ my-package.js // the actual file running the code

Any suggestions/best practices? Or is it just a matter of using the right filepath?

via Nicky