planttheidea/fast-copy

Health v2 · maintenance only

Adoption not part of the score

1159 stars · 26 forks observed · 2026-09-03

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

fast-copy is a JavaScript library providing a highly performant deep copy (clone) of objects, arrays, Maps, Sets, and other complex structures, including circular references. It offers a strict copy mode and a createCopier API for building custom copiers.

Use cases

• deep clone a javascript object
• copy nested objects with circular references
• fast deep copy for state management
• clone maps and sets deeply
• create a custom deep copier for specific types
• copy objects without mutating the original

When to choose

• you need the fastest available deep clone in JavaScript benchmarks
• your data includes Maps, Sets, dates, or circular references
• you want a tiny, dependency-light utility with a customizable copier API

When to avoid

• you only need a shallow copy (Object.assign or spread suffices)
• you need structuredClone's exact semantics or transferable support
• you require copying non-enumerable properties with high performance (copyStrict is much slower)

Facets

library · maturity active

serialization developer-tools developer-tools web-development browser cross-platform deep-clone deep-copy javascript performance circular-references immutable-state algorithms nodejs

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