Due to its asynchronous, non-blocking I/O (input/output processing) and its event-driven nature, Node.js is a good choice for building modern solutions based on micro-services, event queues, jobs, and WebSocket. It’s a relatively young runtime environment which has both pros and cons – on the one hand, its libraries and patterns are less mature and stable, on the other hand, its approach is very modern. Node.js has been created many years later than Python, Java or PHP, which makes it more modern and doesn’t require maintaining backward compatibility with solutions from the previous era. This modern approach, designing Node.js’s environment from scratch, and a possibility to learn from the experience of older programming languages, allowed to develop solutions that win the lion’s share of the mobile app market.
Node.js is a good choice for applications that must process a high volume of short messages requiring low latency. Such systems are called real-time applications (RTAs), and they can be easily developed with Node.js. In fact, Node.js is an impeccable choice for data-intensive, real-time apps that run across distributed devices. Take chats, as an example. With Node.js, you can easily serve multiple users and devices, and handle both big traffic and intensive data exchange. Speaking of data – it is also possible to leverage the fact that HTTP requests & responses are essentially data streams, and stream large files or even process them while they’re being uploaded (to encode audio & video, for example). Thanks to its specifications, Node.js is also an advantage for the real-time collaborative drawing/editing-type apps, where you can watch the document being modified live by someone else (such as Trello, Dropbox Paper or Google Docs).
With Node.js configuration & customization come at a price, and if you’re inexperienced or undisciplined, you might lose yourself—or your client.Even though the main Node.js modules are stable, there are many entries in the npm registry which are low-quality or just haven’t been tested and/or documented properly.