How can i make a node.js server to listen to my ip on my lan instead of localhost
By default node will run on every IP address exposed by the host on which it runs. You don't need to do anything special. You already knew the server runs on a particular port. You can prove this, by using that IP address on a browser on that machine:
http://192.168.69.100:portIf that didn't work, you might have your IP address wrong.