This document discusses debugging memory leaks in Node.js applications. It provides an overview of tools for detecting leaks such as node-memwatch, mdb and manta, and heapdump. These tools can monitor memory usage, detect leaks, and take heap snapshots for analysis. The document also shares examples of using these tools and reveals that third-party packages can sometimes contain leaks, so profiling early is important to understand application performance characteristics and identify potential issues.