Memory Leak Detection

Overview
When to Use
Quick Start
Reference Guides
Best Practices

Overview

Identify and fix memory leaks to prevent out-of-memory crashes and optimize application performance.

When to Use

Memory usage growing over time
Out of memory (OOM) errors
Performance degradation
Container restarts
High memory consumption

Quick Start

Minimal working example:

typescript

import v8 from "v8";
import fs from "fs";

class MemoryProfiler {
  takeSnapshot(filename: string): void {
    const snapshot = v8.writeHeapSnapshot(filename);
    console.log(`Heap snapshot saved to ${snapshot}`);
  }

  getMemoryUsage(): NodeJS.MemoryUsage {
    return process.memoryUsage();
  }

  formatMemory(bytes: number): string {
    return `${(bytes / 1024 / 1024).toFixed(2)} MB`;
  }

  printMemoryUsage(): void {
    const usage = this.getMemoryUsage();

    console.log("Memory Usage:");
    console.log(`  RSS: ${this.formatMemory(usage.rss)}`);
    console.log(`  Heap Total: ${this.formatMemory(usage.heapTotal)}`);
    console.log(`  Heap Used: ${this.formatMemory(usage.heapUsed)}`);
    console.log(`  External: ${this.formatMemory(usage.external)}`);
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

Guide	Contents
Node.js Heap Snapshots	Node.js Heap Snapshots
Memory Leak Detection Middleware	Memory Leak Detection Middleware
Common Memory Leak Patterns	Common Memory Leak Patterns
Python Memory Profiling	Python Memory Profiling
WeakMap/WeakRef for Cache	WeakMap/WeakRef for Cache
Memory Monitoring in Production	Memory Monitoring in Production

Best Practices

✅ DO

Remove event listeners when done
Clear timers and intervals
Use WeakMap/WeakRef for caches
Limit cache sizes
Monitor memory in production
Profile regularly
Clean up after tests

❌ DON'T

Create circular references
Hold references to large objects unnecessarily
Forget to clean up resources
Ignore memory growth
Skip WeakMap for object caches

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Memory Leak Detection

Table of Contents

Overview

When to Use

Quick Start

Reference Guides

Best Practices

✅ DO

❌ DON'T