How do you ensure high availability of a Node.js application?

Thank you for that insightful question. Ensuring high availability and optimal performance of a Node.js application, especially under high load, is pivotal. My approach encompasses several strategies, honed from my extensive experience developing and managing scalable systems at leading tech companies. Firstly, Load Balancing plays a critical role. By distributing incoming traffic across multiple servers or instances, we mitigate the risk of overloading a single server. In my previous projects, I've utilized both DNS and hardware load balancers, but I've found NGINX to be particularly effective when used as a reverse proxy. This not only aids in handling high traffic but also in achieving fault tolerance. Another essential strategy is the use of Clusters. Node.js operates on a single thread, which can become a bottleneck...