You can access your own packages from custom git repos in package.json.
"dependencies": {
"express": : "~4.11.1",
"my-package": "git+ssh://g...@bitbucket.org:my-org/my-package.git#branch",
....
}
npm install/update will update these each time, I think. You can hit specific branches, tags or refs with #ref part at the end, or just use master.
From then on, use it as normal packages:
var package = require('my-package');
Zlatko