Phase 1 · JavaScript Visualizer
See how your code actually runs
CodeVision animates the call stack, memory heap, event loop, and queues step-by-step — so you can finally see why async code behaves the way it does.
Call Stack
Watch frames push and pop in real time as functions execute.
Heap & GC
See objects allocated, referenced, and garbage-collected.
Event Loop
Microtasks, macrotasks, Web APIs — finally make sense.
More modules coming: React render cycle · Next.js SSR/CSR · DBMS · Network