JS Visualizer

JS Visualizer is a free interactive JavaScript visualizer that simulates the JavaScript runtime in real time. Step through code line-by-line and watch the call stack, Web APIs, task queue, microtask queue, event loop, and a force-directed memory graph animate as your code executes. Built for developers learning async/await, Promises, closures, generators, classes, and the event loop, JS Visualizer turns abstract runtime behavior into something you can watch and reason about. Synchronous execution, call stack, Promises, microtasks, timers, event loop, async/await, advanced patterns, error handling, Web APIs, hoisting & TDZ, scope & closures, this binding, type coercion, Map & Set, classes, operators, destructuring, built-ins, generators, inheritance, metaprogramming, binary data.