The structuredClone function provides native deep cloning with support for complex types. Here's how to use it effectively.
Basic Usage#
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vs Other Methods#
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Supported Types#
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Unsupported Types#
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Transfer Instead of Clone#
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Circular References#
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Practical Examples#
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Form State Snapshot#
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Worker Communication#
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Deep Freeze with Clone#
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Performance Comparison#
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Error Handling#
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Best Practices#
When to Use:
✓ Deep cloning objects
✓ Preserving built-in types
✓ Handling circular refs
✓ State snapshots
✓ Worker communication
Supported Types:
✓ Objects, Arrays
✓ Date, RegExp
✓ Map, Set
✓ ArrayBuffer, TypedArrays
✓ Error objects
Not Supported:
✗ Functions
✗ Symbols
✗ DOM nodes
✗ Class prototypes
Performance:
✓ Faster than JSON for complex objects
✓ Use transfer for large ArrayBuffers
✓ Consider lazy cloning for huge objects
Conclusion#
The structuredClone function provides native deep cloning with proper handling of Date, RegExp, Map, Set, ArrayBuffer, and circular references. Use it instead of JSON.parse/stringify for accurate type preservation and instead of spread for true deep copies. Transfer ArrayBuffers for zero-copy performance with large data. Remember that functions, Symbols, and DOM nodes cannot be cloned - handle these cases with custom clone methods or alternatives.