These design choices aim to optimize throughput and scalability in web applications with many input/output operations, as well as for real-time Web applications (e.g., real-time communication programs and browser games). Node.js has an event-driven architecture capable of asynchronous I/O. Consequently, Node.js represents a 'JavaScript everywhere' paradigm, unifying web-application development around a single programming language, as opposed to using different languages for the server- versus client-side programming.

The ability to run JavaScript code on the server is often used to generate dynamic web page content before the page is sent to the user's web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting. Node.js is a back-end JavaScript runtime environment, runs on the V8 JavaScript Engine, and executes JavaScript code outside a web browser. Node.js is a cross-platform, open-source server environment that can run on Windows, Linux, Unix, macOS, and more. Z/OS, Linux, macOS, Microsoft Windows, SmartOS, FreeBSD, OpenBSD, IBM AIX

Node js windows 7