title: Find unused npm packages in package.json
body: <p>Is there a way to determine if you have packages in your <code>package.json</code> file that are no longer needed?</p>
  <p>For instance, when trying out a package and later commenting or deleting code, but forgetting to uninstall it, I end up with a couple packages that could be deleted.</p>
  <p>What would be an efficient way to determine if a package could safely be deleted?</p>