How does JavaScript handle async code?
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JavaScript is single-threaded, meaning it executes one task at a time. However, it efficiently handles asynchronous code using the event loop, callback queue, and Web APIs.
Synchronous Execution
By default, JavaScript runs code line by line in the call stack. If a task is slow (e.g., network request), it can block execution. To avoid blocking, async mechanisms are used.
Asynchronous Code
Tasks like fetching data, timers, or file operations run outside the main thread with the help of Web APIs provided by the browser (or Node.js). Once completed, they return results via callbacks, promises, or async/await.
Callbacks
A function passed to another function to execute later. Example:
setTimeout(() => console.log("Done"), 1000);
The callback runs after 1 second, without blocking other code.
Promises
An object representing a future value (success or failure). Example:
fetch("data.json")
.then(res => res.json())
.then(data => console.log(data))
.catch(err => console.error(err));
Async/Await
Syntactic sugar over promises, making async code look synchronous. Example:
async function getData() {
try {
let res = await fetch("data.json");
let data = await res.json();
console.log(data);
} catch (err) {
console.error(err);
}
}
Event Loop & Task Queue
The call stack executes synchronous code.
Async tasks are handled by Web APIs.
Once ready, their callbacks go to the task queue (or microtask queue for promises).
The event loop continuously checks the stack: if empty, it pushes queued tasks for execution.
👉 In short: JavaScript manages async tasks using event loop + callbacks + promises + async/await, ensuring non-blocking, efficient performance.
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