✓ SANDBOX VERIFIED (95% Confidence)
nodejs
ID: rec_nodejs_structured_clone_053
JSON.parse(JSON.stringify()) deep-clone limitation: use native structuredClone()
JSON.parse(JSON.stringify(obj)) loses Dates, Maps, Sets, and undefined values. Node 17+ and modern browsers provide native structuredClone().
💡 Verified Solution
Use native structuredClone(data) for reliable deep-cloning.
Patch / Unified Code Diff:
--- old.js
+++ new.js
@@ -1,1 +1,1 @@
-const copy = JSON.parse(JSON.stringify(original));
+const copy = structuredClone(original);
Official Primary Reference:
https://nodejs.org/api/globals.html#structuredclonevalue-options
🧪 Sandbox Execution Evidence
Exit Code: 0
Tests Passed: 1 / 1
Confidence: 95%
Protocol: MCP 2026
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