How to change it from 5858 to 7000, for example?
You can use --debug option:
--debug
node --debug=7000 app.js
You can use --inspect option for latest node >= v8
--inspect
node --inspect=7000 app.js
https://nodejs.org/en/docs/inspector/
in unix command line just try this
$ PORT=7000 node --debug app.js
For nodejs version >= v8 use this:
node --inspect=7000 --inspect-brk app.js