Juice: JS Web Framework

"Juice is a server-side web framework built around CommonJS modules and specifically the JSGI 0.3 proposal. Its an open-source stack released under the MIT license that comes bundled with its own development server and a javascript interpreter."

Lower barriers.

• With your client-side and server-side code in the same language, your development won't hit as many communication blocks or gear changes.

Share code between client and server.

• Common helpers and validation routines written only need writing once and can be used in your controllers, templates and client-side code.

Sounds like the right way to do it.  http://juicejs.org/