Node.js' approach allows us to write a server which can handle hundreds of thousands of concurrent users on relatively modest hardware, all without having to worry about the multi threading issues which often plague non-event-driven systems. This ensures highly performant real time web applications with high connectivity
Node.js packages exist for almost any technology that it can interface with. There are over 250,000 modules on npm (node packager manager), many of them downloaded more than 100,000 times per day. This means that we don't need to waste time building support for other tools and can focus on business problems, while being confident that the modules are heavily used and tested. This means rapid, effective development of complex applications
There is little boilerplate in a Node.js server so we can start working on features rapidly. The great performance of Node.js comes out of the box rather than requiring a lot of tweaking. This means that we can deliver rapid results. The ecosystem has also had time to mature and there now are several frameworks that allow you to effectively build scalable, complex applications.
Yunong Xiao, Principal Software Engineer at Netflix