Web Reference: 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. Feb 28, 2023 · Node.js callbacks are a special type of function passed as an argument to another function. They're called when the function that contains the callback as an argument completes its execution, and allows the code in the callback to run in the meantime. 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)
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