What you'll learn

Asynchronous JavaScript can be tough to get right—issues like race conditions, unhandled rejections, and confusing stack traces can degrade performance and user experience. In this course, Debug and Optimize Asynchronous JavaScript, you’ll gain the ability to build resilient, high-performing async workflows. First, you’ll explore how the JavaScript event loop and task queues function under the hood, and how they affect performance and bug behavior. Next, you’ll discover how to use browser and Node.js debugging tools to trace, inspect, and resolve async issues. Finally, you’ll learn how to manage Promises, handle errors, control concurrency, implement retries and cancellations, and offload work using Web Workers. When you’re finished with this course, you’ll have the skills and knowledge of asynchronous JavaScript needed to confidently debug and optimize complex async flows in both frontend and backend environments.