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structuredClone() vs JSON.stringify(): The Right Tool for Deep Copying in JS

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JavaScript developers have long used JSON.parse(JSON.stringify()) as a quick workaround for deep-copying objects, but the technique has notable limitations. It fails to correctly handle data types like Date, Map, Set, and undefined, and throws a TypeError when encountering circular references. The structuredClone() API, built specifically for cloning structured data, handles all these cases more reliably and even preserves circular reference relationships in the cloned output. However, structuredClone() is not without constraints — it cannot clone functions, DOM nodes, or prototype chains. Developers are advised to use structuredClone() for deep copying data and reserve JSON.stringify() for its intended purpose of serialization.

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