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What is structuredClone and when is it useful in Node.js?

Q: What is structuredClone and when is it useful in Node.js?

**TL;DR.** structuredClone(value) is a global that **deep-clones** data using the structured clone algorithm. Unlike JSON.parse(JSON.stringify(x)) , it handles Map , Set , Date , RegExp , typed arrays/ ArrayBuffer , and **cyclic references**. It does **not** copy functions, class prototypes, or DOM-specific types. original Map, Date, cyclic structuredClone <text class='d-te

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Built-in deep cloning of structured data.

nodejscloningstructuredcloneutilities

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Deep clone that JSON would break

const state = { when: new Date(), tags: new Set(['a']), self: null };
state.self = state;                  // cyclic

const copy = structuredClone(state); // works (JSON would throw)
copy.tags.add('b');
console.log(state.tags.has('b'));    // false — fully independent

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