JavaScript Web Workers - A Practical Visual Guide 2026

This course features Coursera Coach! A smarter way to learn with interactive, real-time conversations that help you test your knowledge, challenge assumptions, and deepen your understanding as you progress through the course. In this course, you’ll explore JavaScript runtime environments, the call stack, and how to handle synchronous operations. Learn about web workers and their role in improving concurrency, offloading tasks, and optimizing performance. Through hands-on examples, you'll set up web workers, manage tasks across threads, and monitor CPU utilization. You’ll also refactor code to ensure tasks are distributed evenly among workers, improving application performance. By the end, you'll understand how to use web workers to manage heavy tasks, enhance concurrency, and optimize your JavaScript applications effectively. This course is designed for JavaScript developers with basic programming knowledge. No prior experience with concurrency or web workers is needed. By the end of the course, you will be able to explain runtime environments, manage concurrency using web workers, and optimize application performance.