There are solutions to increment the version number in different application. Cocoa apps have agvtool and maven has the maven-release-plugin which increments the version number on releases. Are there similar tools for nodejs?
I think such a tool seems excessively heavy-handed when the only thing you need to do to increment the version number in Node.js is something as simple as:
sed -i 's/0.1.2/0.2.4/' package.json
Will change the version for your Node.js package?
If you're talking about something that will deploy your code when you explicitly mark a new version, I'd be more inclined to use git hooks and write a script to detect when a git tag is created and then start the deployment process.
You could use the pre-applypatch hook to detect when a tag is being created to run the sed script listed above and run npm publish for you automatically, but again, I don't see the point of having a heavyweight tool handle all of that when it's a simple script away (and said script could be written in Node.js, too!)
grunt-bump provides version bumping, as well as git tagging/commit/push. There are similar packages for other build tools such as gulp-bump.
Similar functionality is also now available with npm version, but with fewer configuration options.