This document summarizes security best practices for Node.js applications. It recommends using the Lusca module to add common security middleware like CSRF protection and Content Security Policy to Express apps. It also stresses the importance of knowing what modules are being required, using secure defaults, escaping all output, keeping dependencies up-to-date, and being aware of templating vulnerabilities. The Node Security Project is mentioned as a resource for auditing modules and contributing patches to improve the overall security of the Node ecosystem.