React 19 brings several enhancements to its core features, including improved debugging tools. One of the lesser-known but powerful hooks is useDebugValue, which helps developers inspect custom hooks more effectively in React DevTools. By providing meaningful labels and structured debug outputs, useDebugValue improves visibility into hook states, making it easier to diagnose performance issues and unexpected behaviors.

In this guide, we’ll explore how useDebugValue works, when to use it, and best practices for integrating it into your custom hooks. Whether you're optimizing performance, debugging complex state logic, or improving developer experience, mastering useDebugValue in React 19 will elevate your debugging workflow.