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Find and Fix a Node.js Memory Leak with Heap Snapshots

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Self-Hosting & Infra intermediate 8 min read $0.01 Updated 2026-10-19

Step-by-step diagnosis of Node.js memory growth: tell a leak from normal heap growth, measure with process.memoryUsage, capture and compare heap snapshots in DevTools, and fix unbounded caches, forgotten listeners, closures and timers.

A Node.js process whose memory climbs until it is killed or restarts. Confirm it is a leak, take heap snapshots, diff them, and fix the usual retainers: caches, listeners, closures and timers.

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#nodejs#memory-leak#heap#debugging#performance

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