Inspect memory usage using V8 heap snapshots - Bun

Bun implements V8’s heap snapshot API, which allows you to create snapshots of the heap at runtime. This helps 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

Chrome DevTools Memory Tab