React Fiber & Reconciliation Visualizer

Step through workInProgress tree diffing, effect flags, and commit phase updates.

Current Status: idle
1. Render Phase (Diffing)2. Commit Phase (DOM Mutation)
Current Fiber Tree (Rendered DOM)Root Node: #root
FiberRootHostRoot
<App />FunctionComponent
<Header />HostComponent
<CounterDisplay count={count} />FunctionComponent
<Badge />HostComponent
workInProgress Tree (Reconciliation)No Active Update

No active reconciler work in progress.

Click setState(count + 1) to trigger reconciliation diff.

Fiber Node Details
Node ID: app
Component: <App />
State: { count: 0 }
Effect Tag / Flag: NoFlags
Reconciliation Engine Logs
Fiber Root initialized.
Initial mount complete. Fiber tree active.