is-website-vulnerable is a command-line tool that scans websites to identify publicly known security vulnerabilities in frontend JavaScript libraries. The tool analyzes JavaScript libraries used by a website and cross-references them against Snyk's vulnerability database to detect known security issues. The tool operates without requiring special setup or configuration and can be deployed through multiple methods including command line interface, Docker containers, or as a GitHub Action. When vulnerabilities are discovered, the tool provides detailed information about the security issues found in the JavaScript libraries. The scanner focuses specifically on frontend JavaScript dependencies and libraries, making it suitable for identifying client-side security risks. It integrates into existing development workflows and continuous integration pipelines through its GitHub Action implementation. The tool leverages Snyk's vulnerability database as its source of truth for known security vulnerabilities, ensuring coverage of publicly disclosed security issues affecting JavaScript libraries commonly used in web applications.