JS Visualizer
Interactive step-through visualizer for the JavaScript event loop, call stack, and memory.
Free - Free to use in the browser
About JS Visualizer
Free, browser-based interactive JavaScript visualizer. Step through code line-by-line and watch the call stack, Web APIs, microtask queue, event loop, and memory graph update in real time. Helps learners and developers master async/await, Promises, closures, and JS runtime behavior for debugging and education.
Key Features
- Line-by-line code stepping with visual updates
- Visual call stack, Web APIs, microtask queue, and event loop
- Memory graph and closure visualization
- Focused on async/await, Promises, and runtime behavior for learning and debugging
Who is this for?
JavaScript developers, learners, and educators who want to understand runtime behavior and async patterns
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