Callback hell also: one of the common evils of asynchronous programming is a blocking-in-nest callback which makes readability and maintenance of code difficult. But to clear out the problem, more natural features of language such as promises or async/await may be used. CPU-Bound Tasks: On the other hand, Node js makes for a poor-performing environment for CPU demanding tasks, as i... https://blogs.sparkifysolutions.com/introduction-of-node-js/