--- title: Find & Fix Node.js Memory Leaks with Heap Snapshots description: Memory leaks in Node.js applications cause gradual memory growth until containers crash or restart. Heap snapshots provide detailed dumps of JavaScript memory... canonical: https://daily.dev/posts/find-fix-node-js-memory-leaks-with-heap-snapshots-89dj8jypm twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Find & Fix Node.js Memory Leaks with Heap Snapshots | daily.dev og:description: Memory leaks in Node.js applications cause gradual memory growth until containers crash or restart. Heap snapshots provide detailed dumps of JavaScript memory... og:url: https://daily.dev/posts/find-fix-node-js-memory-leaks-with-heap-snapshots-89dj8jypm og:image: https://api.daily.dev/og/posts/89Dj8JyPm.png og:image:alt: Find & Fix Node.js Memory Leaks with Heap Snapshots og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Find & Fix Node.js Memory Leaks with Heap Snapshots **[Halodoc](https://daily.dev/sources/halodoc)** · 12 min read · 18 upvotes · 0 comments ## Summary Memory leaks in Node.js applications cause gradual memory growth until containers crash or restart. Heap snapshots provide detailed dumps of JavaScript memory at specific moments, revealing which objects consume memory and why they aren't garbage collected. The article demonstrates capturing snapshots using Node.js V8 API, triggering them on app start, via SIGUSR2 signals, and automatically during OOM events. Analysis involves comparing multiple snapshots in Chrome DevTools to identify growing objects, examining retained sizes, and tracing retainer chains to find root causes. Common leak patterns include lingering timers, unremoved event listeners, unclosed RxJS subscriptions, and closures retaining large objects. The solution includes storing snapshots securely in S3 with encryption and automatic expiry, enabling systematic debugging of production memory issues. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [The Secret Life of JavaScript: The Garbage Collector](https://daily.dev/posts/the-secret-life-of-javascript-the-garbage-collector-r96mslcqu) · DEV · 8 upvotes · 1 comments - [How to Fix Memory Leaks in JavaScript PDF Viewers: Best Practices and Debugging Tips](https://daily.dev/posts/how-to-fix-memory-leaks-in-javascript-pdf-viewers-best-practices-and-debugging-tips-jhhmkz4eb) · Syncfusion · 2 upvotes · 0 comments - [The Memory Hermes Can't See: Stale Shadow Nodes in RN](https://daily.dev/posts/the-memory-hermes-can-t-see-stale-shadow-nodes-in-rn-mgjv6pri7) · Software Mansion · 0 upvotes · 0 comments --- Tags: [#performance](https://daily.dev/tags/performance), [#nodejs](https://daily.dev/tags/nodejs), [#angular](https://daily.dev/tags/angular) [View this post on daily.dev](https://daily.dev/posts/find-fix-node-js-memory-leaks-with-heap-snapshots-89dj8jypm) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Find & Fix Node.js Memory Leaks with Heap Snapshots","url":"https://daily.dev/posts/find-fix-node-js-memory-leaks-with-heap-snapshots-89dj8jypm","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/find-fix-node-js-memory-leaks-with-heap-snapshots-89dj8jypm"},"datePublished":"2025-10-24T06:23:51.664Z","dateModified":"2025-10-24T06:24:22.565Z","description":"Memory leaks in Node.js applications cause gradual memory growth until containers crash or restart. 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