Call Stack Visualizer
Watch function calls push frames onto the stack and returns pop them off. See recursion, branching, and stack overflow in action with step-by-step animation.
Step Log
Each push and pop of a stack frame is recorded here.
Frequently Asked Questions
Q What is a call stack?
A call stack is a data structure that your programming language uses to keep track of active function calls. When a function is called, a frame is pushed onto the stack. When it returns, the frame is popped. This visualizer shows that process step by step.
Q What is stack overflow?
Stack overflow happens when too many frames are pushed onto the call stack without any returning. This usually occurs with runaway recursion. The visualizer demonstrates this with deeply nested function calls.
Q Can I slow down the animation?
Yes. Use the speed slider at the top of the tool to adjust the delay between steps. You can set it from 100ms (fast) to 2000ms (slow) to follow each frame push and pop carefully.