title: How to give a custom url in package.json for a package
body: <p>I have done customization in a <code>npm package</code> inside <code>node_modules</code> folder. Now I want to <strong>deploy it on heroku</strong>. But what heroku does is It will see the package.json and <strong>install the fresh package</strong>.</p>
  
  <p>So someone suggested me to provide the <strong>custom url for a npm package</strong>, So that Heroku will download the npm package from this custom url not from npm.</p>
  
  <p>How can I achieve the same?</p>