I built a free LeetCode visualizer. Here's what I learned making 207 problems animate line by line.

📰 Dev.to · Rajan shukla

Learn how building a LeetCode visualizer can help improve coding skills by animating solutions line by line, and discover key takeaways from the author's experience

intermediate Published 11 Apr 2026

Action Steps

Build a visualizer tool using a programming language like JavaScript or Python to animate LeetCode problems
Use a library or framework like D3.js or Matplotlib to create interactive and dynamic visualizations
Select a set of LeetCode problems to animate, such as sorting algorithms or graph traversals
Write code to parse the solutions and generate animations line by line
Test and refine the visualizer tool to ensure accuracy and usability

Who Needs to Know This

This project can benefit software engineers and developers who want to improve their coding skills and understanding of algorithms, as well as DevOps teams looking to create interactive tools for learning and training

Key Insight

💡 Visualizing code execution can significantly improve understanding and retention of complex algorithms and data structures