Profiling refers to analyzing and measuring an application's performance characteristics.
Profiling helps identify performance bottlenecks in a Node.js app, such as CPU-intensive tasks like cryptographic operations, image processing, or complex calculations.
This post covers running a profiler for various Node.js apps in Chrome DevTools.
Prerequisites
Google Chrome installed
Node.js app bootstrapped
Setup
Run
node --inspect app.jsto start the debugger.Open
chrome://inspect, clickOpen dedicated DevTools for Nodeand then navigate to the Performance tab. Start recording.Run load testing via autocannon package using the following command format
npx autocannon <COMMAND>.Stop recording in Chrome DevTools.
Profiling
On Perfomance tab in Chrome DevTools open Bottom-Up subtab to identify which functions consume the most time.
Look for potential performance bottlenecks, such as synchronous functions for hashing (pbkdf2Sync) or file system operations (readFileSync).
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