title: How to specify project npm registry inside package.json file
body: <p>I am working on multiple projects at the same time and the node module registry for different projects are not the same.</p>
  
  <p>For example, all modules for project <strong>A</strong> are from <code>http://registroy.foo.com</code> and modules for project <strong>B</strong> are all from <code>http://registroy.bar.com</code></p>
  
  <p>Is there a way we can specify the registry we want to use for the project inside <code>package.json</code> file, something like <code>source</code> defined inside a Gemfile in Ruby.</p>