Node Mem Leak

This project is to demonstrate a leak and how to fix it with proper teardown. It is based on https://techtldr.com/simple-guide-to-finding-a-javascript-memory-leak-in-node-js/

Leak and observe

First run npm run leak w/out options, and finish the steps to see the leak chart.

Then run it again with the flags to see the fix.

1. npm i
2. npm run leak
   • npm run leak -- --fixed (fix the leak)
   • npm run leak -- --clean (clean heapdump files)
   • npm run leak -- --fixed --clean (fix the leak, clean heapdump files)
3. ctrl+c
4. npm run server
5. Navigate browser to http://localhost:3000
6. Observe the leak chart of memory over time
   • If no --fixed flag you'll see up and to the right
   • if --fixed flag you'll see it flatten out and maintain

Leaking Example

Fixed Leak Example

Run Results Bunched Together

NOTE: If you run npm run leak and then npm run leak again it'll stack. So you will see ALL of the heapdumps over time even after you run npm run leak -- --fixed.