npm install npm-doc

var doc = require("npm-doc");

// Note that getDocs wouldn't normally be called in sequence like this.
// Packages can be specified by...

// ...a single package name.
doc.getDocs("npm", function (err, data) {
  if (err) console.error(err.stack);
  else console.log(data);
});

// ...an array of package names.
doc.getDocs(["npm", "express", "socket.io"] , function (err, data) {
  if (err) console.error(err.stack);
  else console.log(data);
});

// ... or an object of name:version pairs.
doc.getDocs({"oauth": "0.8.0", "jade": "0.5.6"}, function (err, data) {
  if (err) console.error(err.stack);
  else console.log(data);
});

{ docs: <Object containing names and text of doc markdown files>,
  README: <Text of README markdown file>
}

{ npm:
  { docs:
    { activate: ...
      adduser: ...
      build: ...
      ...
    }
    , README: ...
  }
}

npm uninstall npm-doc