Source Code Atlas

• 

  Website Page

Inspiration

As developers, we often inherit or contribute to large codebases with little to no context. Understanding the structure, dependencies, and relationships between files can be daunting, especially in open-source or legacy repositories. Source Code Atlas was born out of this pain point—to create a powerful, visual tool that makes it easy to understand any GitHub repository at a glance, accelerating onboarding, code review, and architectural analysis.

What it does

Source Code Atlas is a web application that visualizes GitHub repositories. It provides:

An interactive map of the file structure

Dependency graphs showing relationships between files/components

Code previews with syntax highlighting

Export options (PNG, PDF, Markdown, Mermaid)

An intuitive UI with responsive design for browsing and analyzing repositories

With just a repository URL, users can explore and export detailed visuals of how a codebase is organized and how its files interact.

How I built it

The app is built using:

React 18 + TypeScript for the frontend framework

Vite for lightning-fast builds

Tailwind CSS and shadcn/ui for responsive, modern UI

React Flow for rendering file structure and dependency graphs

html2canvas and jsPDF for export features

GitHub REST API for fetching repository data

Native Fetch API, React Router DOM, and custom hooks for seamless data flow and navigation

Visualization states, interactions like zoom/pan/select, and real-time UI updates are handled using React hooks and dynamic canvas rendering.

Challenges I ran into

GitHub API rate limits required efficient caching and optional token support

Visualizing large repositories posed performance issues; solved with lazy loading and optimized rendering

Parsing dependencies accurately across diverse file types required building custom logic

Exporting visuals while preserving resolution and interactivity was tricky with HTML-based rendering

Accomplishments that I am proud of

Built a smooth and responsive UX that works well across devices

Implemented multi-format exports, including Markdown + Mermaid—a developer favorite!

Managed to represent complex file and dependency graphs in a digestible, intuitive format

Designed a fully client-side experience with zero sensitive data storage for maximum privacy

What I learned

Advanced usage of React Flow for dynamic visualization

GitHub API intricacies and how to work within its constraints

Best practices for creating developer tools with clear UX and meaningful insights

Techniques for exporting web content to different formats effectively

Importance of modular design and performance optimization in frontend-heavy applications

What's next for Source Code Atlas

Private repository support via OAuth/token integration

Custom visualization layouts (e.g., by module, by size, or by complexity)

Real-time collaboration for team-based code reviews and pair programming

Integration with GitLab and Bitbucket

In-depth static analysis tools (e.g., complexity metrics, linting reports)

VSCode Extension version for inline visualization during development

Built With

• react
• shadcn-ui
• tailwind
• typescript