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6 min

Mastering JavaScript Promises
Promises help you write cleaner asynchronous code by representing a value that may be available now, later, or never.
Why Promises?
- Avoids callback hell
- Easier to read and maintain
- Works seamlessly with async/await
Basic Example
const fetchUser = () => {
return fetch('/api/user')
.then(res => res.json())
.catch(err => console.error(err));
}
Chaining Promises
fetch('/api/user')
.then(res => res.json())
.then(user => fetch(`/api/posts?user=${user.id}`))
.then(res => res.json())
.then(posts => console.log(posts))
.catch(err => console.error(err));
Key Takeaways
- Always return promises from
.then() - Use
.catch()for error handling - Prefer async/await for readability
Happy coding! 🚀
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