Inspect memory usage using V8 heap snapshots

Bun implements V8’s heap snapshot API. Use it to capture the heap at runtime and debug memory leaks in your JavaScript/TypeScript application.

snapshot.ts

import v8 from "node:v8";

// Creates a heap snapshot file with an auto-generated name
const snapshotPath = v8.writeHeapSnapshot();
console.log(`Heap snapshot written to: ${snapshotPath}`);

Inspect memory in Chrome DevTools

To view V8 heap snapshots in Chrome DevTools:

Open Chrome DevTools (F12 or right-click and select “Inspect”)
Go to the “Memory” tab
Click the “Load” button (folder icon)
Select your .heapsnapshot file

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Inspect memory usage using V8 heap snapshots

Inspect memory in Chrome DevTools

​Inspect memory in Chrome DevTools

Inspect memory in Chrome DevTools