Creating a user to run a nodejs app?

Question

System administration

Installed nodejs on Ubuntu Server 12.04. Now I need to run nodejs as a user who only has access to run the nodejs server and access to the project directory. Tell me how to create such a user and restrict his rights?
The application is stored in the /var/www/app directory

Answer 1

sudo adduser \\
    --system \\
    --shell /bin/bash \\
    --gecos 'user for running node.js projects' \\
    --group \\
    --disabled-password \\
    --home /home/node \\
    node