JS Runtime Visualizer

Visualize the Event Loop, Call Stack, and Task Queues in real-time.

Editor
Console
Console is empty...
Call Stack (0)
Call stack is empty.
Run some code to see function calls.
Web APIs
No active Web APIs.
Event Loop
Event Loop
Idle
Execution Steps
No steps logged yet.
Task Queues
Microtask QueuePriority 1
Empty
Macrotask QueuePriority 2
Empty

Call Stack

See how functions are pushed and popped from the stack as they execute in a LIFO (Last-In-First-Out) manner.

Event Loop

Understand the mechanism that coordinates the execution of code, collecting and processing events, and executing queued sub-tasks.

Task Queues

Observe the difference between Microtasks (Promises) and Macrotasks (setTimeout) and how they are prioritized by the engine.

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