Visucodize

A platform offering an optimized way to visualize algorithms directly from your code — minimal changes are enough, yet it is fine-tunable to reflect the algorithm’s nature, with full control over presentation.

Animations of raw code execution are usually not insightful

Rendering the steps of raw code execution shows how the code flows — but often fails to reveal the logic behind it.

Easy to visualize native data structures

Quickly replace plain data structure constructors with Visucodize’s visual ones to enable their visualization — while maintaining full compatibility with their existing APIs and behavior.

Visualize node-based structures seamlessly

Derive visual structures from existing objects like a tree root or linked list head using Visucodize’s visual APIs to seamlessly visualize them — typically without modifying your core logic, though a minor field swap may occasionally be needed.

Fine-tune when needed

Use the rich Visucodize API to shape the visualization around your algorithm’s specific nature.

Editorial solutions with visucodizable code and detailed explanations for selected popular coding problems

Community-shared solutions and comments

Run solutions as-is or modify code and inputs

Write and share your own solutions from scratch

Scratch Mode for building data structures to prototype algorithms

Seamless, flexible visualization of complex data structures and simple variables — with zero changes required to your original code.

Visucodize your code with quick changes, and the flexibility to refine

Use the tabs below to switch between two common Visucodize patterns: replacing constructors or deriving a visual structure from an existing node.

Example flow: begin with plain JavaScript code that duplicates each value in an array, swap the array for a visual one, then add a final touch by highlighting processed items in blue for clarity.

1. Plain JavaScript code

Keep the same algorithm and structure.

function mainFunction() {  const arr = [1, 2, 3, 4];  for (let index = 0; index < arr.length; index++) {    arr[index] *= 2;  }}

2. Swap the data structure

Swap the vanilla array for a visual array that preserves array behavior, visualizes the structure, and animates each update.

function visMainFunction() {  const arr = new VisArray(1, 2, 3, 4);  for (let index = 0; index < arr.length; index++) {    arr[index] *= 2;  }}

3. Emphasize processed items

Highlight the already-processed items in blue for extra clarity.

function visMainFunction() {  const arr = new VisArray(1, 2, 3, 4);  for (let index = 0; index < arr.length; index++) {    arr[index] *= 2;    arr.makeVisManagerForIndex(index).setProp('backgroundColor', 'blue');  }}

This is a small sample of the Visucodize API. Explore the full API in the documentation.

Code Mode Use Cases

Visucodize lets you visualize your code with minimal changes, and its API gives you the flexibility to reflect the algorithm’s nature. See the selected use cases below. Note that most of these examples focus on making the visualization clear for a general audience, but depending on your goal you might need even less changes for the same algorithm — sometimes a single line is enough.

Use case 1 - tutorial

Binary Search — Highlight index variables on the array

A tutorial on visualizing binary search in Visucodize: start from raw JS, then register left and right variables as array indices so their positions are highlighted automatically and updated as the pointers move. Next, highlight the computed mid at the start of each iteration, then clear it at the end. Finally, if a textual explanation of certain steps helps, add notifications to provide it.

View the tutorial →

Core Workflows

Explore Problems and Solutions

Browse curated problem lists or search for specific problems. Open any problem to view editorial and community solutions, solve it from scratch, or fork and refine existing solutions. Run any solution to animate it.

Start Exploring

Code Mode

Write and manage your visucodized (animatable) code locally, run it with your desired input to animate the execution, and share it remotely whenever you want.

Start Coding

Scratch Mode

Create and modify data structures visually using interactive tools, then export them in supported formats if you prefer. Exported structures can be imported as inputs in Code Mode when the format matches.

Start Scratching