How to check and change the Nodejs version on Ubuntu?

You can check your version by using this code (node -v) in linux terminal and If you want to upgrade it to stable version you can use following codes one by one.

sudo npm cache clean -f
sudo npm install -g n
sudo n stable

Just type npm version in your command line and it will display all the version details about node, npm, v8 engine etc.

To change your node version, I'd recommend installing nvm. Once installed, switch versions follow the instruction below;

nvm use <any specified version you prefer "example v16.0.0">

Example:

nvm alias default 16

This will enforce as the current default version.