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RailwayJS is a nice framework built on the same principle as Rails.
I have been hacking on a project in Node.js/Express.js for some time now.
No, not “because I said so.” The best reason to pay attention to node.js is the audience that is paying attention to it.
In the short time since its initial release in late 2009, Node.js has captured the interest of thousands of experienced developers, grown a package manager and a corpus of interesting modules and applications, and even spawned a number of startups.
Node.js is Important. An Introduction