Node.js simplifies development by letting you use a single language on the client and server. This has the added benefit of keeping your apps DRY because you can share code between them.

Its package registry, npm, is the largest of any language. With over 500,000 packages and 500+ new packages being registered every day, you can almost always find what you're looking for. And if you can't, why not make your own and share it with the world? Node.js