Usecases of NodeJS. Walmart and ebay. Node is not the best platform for CPU intensive heavy computational applications. But it is ideal for building fast and scalable network applications. NodeJS is capable of handling a huge number of simultaneous connections with high throughput. For each connection NodeJS does not spawn new Thread causing max out of memory instead handle all in single thread using non-blocking I/O model. Using this architecture NodeJS has achieved over 1 Million concurrent connections. Bubbling errors up to NodeJS core event loop will cause crashing the entire program. Netflix and Uber. NodeJs is best for, I/O bound applications. Data streaming applications. Data intensive real-time applications. JSON APIs based applications. Single page applications. Modules in NodeJS. In order a design to be reliable and maintainable should avoid defining variables and functions in the global scope. Instead we can use modular...