What is the difference between callbacks and promises in Node.js?

Answer 1

In Node.js, callbacks and promises are two ways to handle asynchronous operations. Callbacks are functions that are passed as arguments to another function and are called once the operation is completed. Promises, on the other hand, represent a value that may not be available yet, but will be resolved at some point in the future.

The main difference between callbacks and promises is that callbacks can lead to callback hell, where multiple nested callbacks become difficult to manage and read, while promises use a chain of .then() statements to handle asynchronous operations in a more readable and manageable way. Promises also provide error handling through .catch() statements, whereas error handling with callbacks can be more error-prone and difficult to manage.

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