How to use promises and async/await in JavaScript

What to know about promises and async/await in JavaScript

Async functions and await make asynchronous code easier to understand and reason about. This chapter explains the concept, demonstrates a practical example, and gives you a guided exercise.

How to use promises and async/await in JavaScript

Start with a small function, make inputs and outputs explicit, and test both normal and edge cases. Use browser developer tools to inspect values and errors as you build.

Example: promises and async/await in JavaScript

Use this example as a starting point. Identify the part that controls the result, then adapt it to your own page or project.

async function loadData() {
  const response = await fetch("/api/data");
  return response.json();
}

Common questions about promises and async/await

When should I use promises and async/await?

Use this technique when it expresses the structure, styling, or behavior your page needs. Keep the implementation focused and test it with the surrounding content.

What should I practice next?

Build one small interaction that reads a value, validates it, updates the page, and handles an empty or invalid input.