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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":" Cache key expired or removed throws with \"Cannot read properties of undefined (reading 'v')\"","articleBody":"When using node-cache in a TypeScript/Node.js project, I encounter the following error when calling .get() or .del() on a key that is missing or expired:\n\n```json\n{\n      \"type\": \"TypeError\",\n      \"message\": \"Cannot read properties of undefined (reading 'v')\",\n      \"stack\":\n          TypeError: Cannot read properties of undefined (reading 'v')\n              at NodeCache._unwrap (/app/node_modules/node-cache/lib/node_cache.js:711:19)\n              at NodeCache.get (/app/node_modules/node-cache/lib/node_cache.js:368:23)\n              at setDocumentCache (file:///app/dist/utils/document.js:18:36)\n              at newDocumentFromData (file:///app/dist/utils/document.js:34:9)\n              at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n              at async Object.getPdfMetadata (file:///app/dist/plugins/live-document-service.js:36:33)\n              at async Object.\u003canonymous\u003e (file:///app/dist/routes/preview/pdf-metadata.js:86:19)\n    }\n```\n\n#### Steps to Reproduce:\n\n1. Create a cache instance with `deleteOnExpire: false`\n2. Call .get() on a key that does not exist or has expired.\n3. The error occurs inside the library when it tries to access .v of undefined.\n\n```typescript\nconst documentCache = new NodeCache({\n  stdTTL: 60 * 2, // 2 minutes\n  useClones: false,\n  deleteOnExpire: false,\n});\n\ndocumentCache.on(\"expired\", (key, pdfDocument) =\u003e {\n  if (typeof pdfDocument?.cleanup === \"function\") {\n    pdfDocument.cleanup();\n  }\n  documentCache.del(key);\n});\n\nfunction setDocumentCache(cacheKey: string, pdfDocument: PDFDocumentProxy) {\n  const existing = documentCache.get\u003cPDFDocumentProxy\u003e(cacheKey);\n  if (typeof existing?.cleanup === \"function\") {\n    existing.cleanup();\n  }\n  documentCache.set(cacheKey, pdfDocument);\n}\n```\n\n#### Expected Behavior:\n\nCalling .get() on a missing or expired key should return undefined without throwing an error.\n\n#### Environment:\n\n- node-cache version: 5.1.2\n- Node.js version: lts-bullseye\n\n#### Additional Context:\n\nSeems to be triggered by the library’s internal _unwrap method.","author":{"url":"https://github.com/twrayden","@type":"Person","name":"twrayden"},"datePublished":"2025-10-08T07:10:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/329/node-cache/issues/329"}