Web Reference: A callback is a simple function that's passed as a value to another function, and will only be executed when the event happens. We can do this because JavaScript has first-class functions, which can be assigned to variables and passed around to other functions (called higher-order functions) A Callback in Node.js is an asynchronous equivalent for a function. It is a special type of function passed as an argument to another function. Node.js makes heavy use of callbacks. Callbacks help us make asynchronous calls. All the APIs of Node are written in such a way that they support callbacks. Programming instructions are executed synchronous... Mar 3, 2026 · In Node.js, callbacks enable asynchronous, non-blocking execution, while methods like readFileSync () perform blocking operations. The fs module provides both synchronous and asynchronous approaches to handle file system tasks.
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