Deno Debugger

About

Connects Claude directly to Deno applications via the V8 Inspector Protocol for advanced runtime troubleshooting. By utilizing specialized scripts for heap analysis and CPU profiling, it allows for deep investigation into memory leaks, algorithmic complexity (O(n²) detection), and concurrency bugs. It provides a structured workflow for forming hypotheses, tracking investigation reasoning through breadcrumbs, and generating detailed diagnostic reports, ensuring that even complex production issues are resolved with precision.

Key Features

• Interactive V8 Inspector Protocol client for real-time debugging and variable inspection
• Investigation tracking using breadcrumbs to document reasoning, hypotheses, and key findings
• 2 GitHub stars
• Performance bottleneck analysis with CPU profiling and automatic O(n²) algorithmic complexity detection
• Race condition troubleshooting via conditional breakpoints and concurrent request simulation
• Memory leak detection through heap snapshot comparison with optimized modes for large heaps

Use Cases

• Optimizing slow API endpoints by identifying inefficient loops and CPU hotspots using flamegraphs
• Troubleshooting intermittent race conditions or crashes in complex asynchronous Deno applications
• Identifying and fixing memory leaks when heap usage grows unexpectedly over time