The util module provides essential utilities for debugging, formatting, and working with callbacks. Here's how to use it.
promisify
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callbackify
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format and formatWithOptions
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inspect
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debuglog
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types
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deprecate
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inherits (Legacy)
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getSystemErrorName
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parseArgs
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TextEncoder/TextDecoder
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Best Practices
Promisify:
✓ Convert callback APIs
✓ Use with async/await
✓ Define custom behavior
✓ Handle multiple values
Debugging:
✓ Use debuglog for dev
✓ Use inspect for logging
✓ Add custom inspect methods
✓ Format with colors
Type Checking:
✓ Use util.types
✓ Check native types
✓ Validate inputs
✓ Handle edge cases
Avoid:
✗ Using inherits (use class)
✗ Ignoring deprecation
✗ Complex format strings
✗ Excessive inspection depth
Conclusion
The util module provides essential utilities for Node.js development. Use promisify for callback-to-promise conversion, debuglog for conditional logging, and inspect for detailed object visualization. The types namespace offers reliable type checking, and parseArgs simplifies CLI argument parsing.