JavaScript Async/Await — Complete Guide for Beginners — JavaScript async await

Master async/await, Promises, and fetch in JavaScript. Handle API calls, errors, and parallel requests.

async/await in JavaScript

JavaScript is single-threaded but non-blocking. Async/await lets you write asynchronous code that reads like synchronous code — essential for fetch, databases, and timers.

Why JavaScript async await Matters

Every API call, database query, and file read in modern JavaScript is asynchronous — async/await is how you manage that complexity.

await only works inside async functions; wrap await in try/catch because rejected Promises become catchable errors.

JavaScript async await — Key Ideas You Must Know

Promises represent future values
async function always returns a Promise
await pauses until Promise resolves
try/catch for async errors
Promise.all for parallel requests

JavaScript async await Code Example

JAVASCRIPT

async function loadUser(id) {
  try {
    const res = await fetch(`/api/users/${id}`);
    if (!res.ok) throw new Error('Failed');
    return await res.json();
  } catch (err) {
    console.error(err);
  }
}

Practice JavaScript async await with Free Lessons

Complete the async/await lessons on Sturdee, then build a weather app with fetch.

Tip: Free interactive lesson: /tutorials/javascript/javascript_async — practice JavaScript async await with runnable code on Sturdee.

JavaScript Async/Await — FAQ

Frequently Asked Questions

async/await vs .then()?+

Same underlying Promises. async/await is cleaner for sequential logic.

JavaScript Async/Await — Complete Guide for Beginners