<name>: {
  <version>: {
    dependencies: {
      <dep-name>: {
        <dep-range>: <dep-version>
      }
    },
    
    asyncDependencies: ...,
    devDependencies: ...
  }
}

var shrinked = require('shrinked');

shrinked('cortex-shrinkwrap.json', {
  dependencyKeys: [
    'dependencies',
    // Then `shrinked` will parse three more keys in addition.
    'asyncDependencies',
    'devDependencies',
    'engines'
  ]
}, function(err, tree){
  if (err) {
    return console.error(err);
  }
  console.log('The B+ tree is', util.inspect(tree, depth: 10));
});