Buffers handle binary data in Node.js. Here's how to use them effectively.
Creating Buffers
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Reading and Writing
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String Encoding
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Buffer Manipulation
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Working with Files
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Binary Protocols
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Crypto Operations
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ArrayBuffer Interop
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Performance Tips
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Best Practices
Memory:
✓ Use Buffer.alloc for sensitive data
✓ Use Buffer.allocUnsafe for performance
✓ Pool buffers when allocating many
✓ Clear sensitive data when done
Encoding:
✓ Always specify encoding
✓ Use Buffer.byteLength for string sizes
✓ Handle multi-byte characters properly
✓ Validate input encodings
Safety:
✓ Check bounds before reading
✓ Use slice/subarray carefully
✓ Copy when sharing externally
✓ Zero sensitive buffers
Performance:
✓ Avoid unnecessary conversions
✓ Use concat over += for binary
✓ Pre-allocate when size is known
✓ Stream large data
Conclusion
Buffers are essential for binary data in Node.js. Understand encoding conversions, use appropriate read/write methods for data types, and be mindful of memory sharing. Use Buffer.alloc for security, allocUnsafe for performance, and always validate bounds when working with binary protocols.