The Vuln Cost extension for Visual Studio Code (VS Code) is a free, open-source tool that helps JavaScript developers identify and address security vulnerabilities in their code. By integrating with the VS Code editor, it provides instant feedback on potential security issues in imported packages, allowing developers to take swift action to secure their projects. The extension also supports scanning of HTML files, including scripts from content delivery networks (CDNs), ensuring developers are not caught off guard by vulnerabilities. With its easy-to-use interface and free functionality, Vuln Cost helps developers adopt a more proactive approach to security, offering actionable insights and recommendations for fixing issues, including package upgrade advice to fix vulnerabilities.