React useDebugValue Hook Guide

The useDebugValue hook displays custom labels for hooks in React DevTools. Here's how to use it effectively.

Best Practices#

When to Use:
✓ Custom hooks in libraries
✓ Complex hook state
✓ Debugging during development
✓ Team collaboration

Format Function:
✓ Use for expensive formatting
✓ Keep formatting simple
✓ Return readable strings
✓ Handle null/undefined

Content:
✓ Show relevant state
✓ Use concise labels
✓ Include counts/status
✓ Format dates/objects

Avoid:
✗ Using in every hook
✗ Complex computations
✗ Sensitive data
✗ Production overhead

useDebugValue enhances custom hooks with descriptive labels in React DevTools. Use the deferred formatting function for expensive operations to avoid performance impact. Focus on displaying the most relevant state information that helps during debugging. It's most valuable for reusable hooks in libraries or complex application hooks that benefit from clear state visibility.

React useDebugValue Hook Guide

Basic Usage#

With Custom Hooks#

Deferred Formatting#

Multiple Debug Values#

Authentication Hook#

Form State Hook#

Timer Hook#

WebSocket Hook#

Media Query Hook#

Composed Hooks#

Conditional Debug Value#

Complex State Debugging#

Best Practices#

Conclusion#

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