title: How do you uninstall all dependencies listed in package.json (NPM)?
body: <p>If I have a package.json file defined in my application root and run <code>npm install -g</code> it will install all the dependencies defined in package.json, globablly.</p>
  
  <p>However, this doesn't seem to work in reverse.</p>
  
  <p>If I do <code>npm uninstall -g</code> in my application root it throws an error, expceting me to pass it a package name.</p>
  
  <p>Shouldn't this also uninstall the same packages I installed?</p>
  
  <p>Am I doing something wrong?</p>