Setting up Node on WSL is easiest when done with NVM. To do this go into bash and run the following:
touch ~/.bashrc
curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash
Once NVM is installed close and reopen bash, then run the following:
nvm install node
At this point you should be able to run node inside bash. This also works inside the VS Code terminal.
The most current release of NVM can be found at https://github.com/creationix/nvm/releases