JavaScript: Asynchronous Code & Fetch

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About Course

Understand how JavaScript handles tasks that take time, such as loading data from a server. Learn the event loop in plain English, callbacks, promises, async and await, error handling, and how to use the Fetch API to GET and POST JSON safely, including checking response.ok, running requests in parallel and cancelling them. All examples tested.

Examples were tested with Node.js 22 (which includes fetch) against a local test server and follow MDN documentation for browsers. API URLs are placeholders.

What Will You Learn?

  • Understand why JavaScript is asynchronous and how the event loop works Use promises with then, catch and finally, and with async and await Fetch and send JSON with the Fetch API and handle errors properly Run requests in parallel, cancel slow requests and avoid common pitfalls

Course Content

Course Lessons

  • Why asynchronous code?
  • Promises, async and await
  • Using the Fetch API
  • Parallel requests, cancelling and good practice

Sources & Further Reading
The official guidance this course is based on.

Final Assessment

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