To uninstall node.js from Ubuntu server.

Here are some commands to run.

To remove the node package but keep the configuration file run :

sudo apt-get remove nodejs

To remove both the node package and it's configuration files run :

sudo apt-get purge nodejs

The final step is to remove any unused files and free up disk space. To do this we run

sudo apt-get autoremove

We have successfully uninstalled node.js and freed up space.