How to use top-level await in JavaScript
Learn how to use this new feature currently available in v8
THE AHA STACK MASTERCLASS
Now open with 50% off launch discount!
Usually can use await only inside async functions. So itβs common to declare an immediately invoked async function expression to wrap it:
(async () => {
await fetch(/* ... */)
})()
or also declare a function and then call it:
const doSomething = async () => {
await fetch(/* ... */)
}
doSomething()
Top-level await will allow us to simply run
await fetch(/* ... */)
without all this boilerplate code.
With a caveat: this only works in ES modules.
For a single JavaScript file, without a bundler, you can save it with the .mjs
extension and you can use top-level await.
β Get my JavaScript Beginner's Handbook
I wrote 20 books to help you become a better developer:
- Astro Handbook
- HTML Handbook
- Next.js Pages Router Handbook
- Alpine.js Handbook
- HTMX Handbook
- TypeScript Handbook
- React Handbook
- SQL Handbook
- Git Cheat Sheet
- Laravel Handbook
- Express Handbook
- Swift Handbook
- Go Handbook
- PHP Handbook
- Python Handbook
- Linux Commands Handbook
- C Handbook
- JavaScript Handbook
- CSS Handbook
- Node.js Handbook