console.log does not appear with pm2

I have a node.js Parse Server app where I need to use console.log to debug the cloud code, the problem is that by launching the app like this:

node index.js

the log appears, but if I launch it with pm2:

pm2 start index.js

the logs of console.log do not appear but if the native parse logs appear, (in the previous case they both appear)

Any ideas? Thanks