How do I get my heroku app's node version?

Is there a way to see which version of node your app on heroku is using?

I saw that you can specify the version of node

"engines": {
    "node": "14.x"
  },

I have not specified a node version this way. But my app was giving me errors as if it was an old version of node where the memory limit is 512mb even though my dyno has a 1gb memory.

Mark-sweep 505.7 (522.4) -> 502.2 (523.1) MB, 440.3 / 0.0 ms  (average mu = 0.280, current mu = 0.148) allocation failure scavenge might not succeed

So is there a way to see what version of node my heroku app is using?

Solution

That's how I did it

heroku run bash --app appname
node -v
# => v16.19.0