Node js Memory Leaks Finding and Fixing with Heap Snapshots

Описание: Q1: What is a heap snapshot?
A tool that shows objects in memory, their sizes, and why they aren’t garbage collected.

Q2: Why is Retained Size important?
It reveals how much memory an object keeps alive, helping detect leaks.

Q3: How can I take snapshots in Node.js?
Using Node Inspector, heapdump module, or built-in node:v8 API.

Q4: Why choose the node:v8 API?
It’s simpler, faster, and doesn't require extra packages.

Q5: What is a Baseline snapshot used for?
To compare memory growth over time.

Q6: Why trigger snapshots with SIGUSR2?
It’s a safe, custom signal that doesn’t disrupt app execution.

Q7: What do the OOM flags do?
They control snapshot count near heap limit and where they’re stored.

Q8: How does Halodoc secure snapshots?
Using S3 encryption, strict IAM, zero public access, and auto-expiry.

Q9: How do you detect a memory leak?
Check Size Delta in Comparison view, then confirm Retained Size in Summary view.

Q10: What causes a closure leak?
Long-lived objects holding references to request data.

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