NodeJS Profiling

Best NodeJS Versions for profiling

If possible, do yourself a favor and test your code to make sure it works with NodeJS version 6.3 or greater.

Profiling

Memory

  1. expose port 9229 if using docker

  2. and start your code: node --inspect --debug-brk myCode.js

    1. it will output a url to connect with chrome://inspect/#devices, go ahead and copy/paste that URL into chrome

  3. under the sourcestab, place breakpoints where ever you want ... then hit play to let the code run

    • Your code starts in "paused" mode because of --debug-brk

  4. take a snapshot, then:

    1. either, run requests against web server to cause load

    2. or, simply let your one-time nodejs code run until it hits a breakpoint

  5. take another snapshot

  6. compare heap snapshots in chrome devtools