CSP Detector is a free Chrome extension designed for web developers and security engineers, providing real-time detection of Content Security Policy (CSP) violations directly from the browser toolbar. This tool monitors web pages for CSP blocks, displaying detailed information about the violations, including the specific directives that triggered them and actionable hints for resolution. With no setup required, users can simply install the extension and begin monitoring their web pages immediately.

Key features include grouping violations by hostname for quick identification of problematic third-party domains, providing a plain-English explanation for each violation, and allowing users to expand for full details on blocked URLs and policies. Additionally, users can export their findings as JSON or CSV files, making it easy to share with teams or for bug reporting. CSP Detector streamlines the process of creating a secure Content Security Policy, making it an essential tool for developers.