Developer License Detector

Detects open-source libraries and their licenses on web pages, analyzing compatibility risks for developers.

🔍 AUTOMATICALLY DETECT LICENSES & PREVENT LEGAL COMPLIANCE ISSUES Developer License Detector is a lightweight, studio-grade Chrome extension that scans web pages in real-time to identify client-side JavaScript libraries, CSS frameworks, fonts, and stylesheets. It instantly checks their licenses against your project's target license, helping you avoid costly legal compliance issues, copyright violations, and copyleft licensing risks before they impact your codebase. Perfect for frontend developers, tech leads, engineering managers, and software legal compliance teams auditing dependencies. ✨ KEY FEATURES 🎯 Advanced Multi-Method Library Detection • Script Tag Analysis - Scans external scripts for CDN patterns (jsDelivr, unpkg, cdnjs, etc.) and source paths. • Main-World Global Object Querying - Bypasses Chrome's isolated content script sandbox by dynamically injecting a query script into the page execution context (Main World) to identify global object signatures (e.g. React, Vue, jQuery, Lodash, Axios). • Stylesheet & CSS Analysis - Automatically parses linked stylesheets and CDN CSS frameworks (Bootstrap, Tailwind, etc.). • Web Font Service Detection - Automatically recognizes Google Fonts, Adobe Typekit, and Font Awesome dependencies. • 100+ Popular Libraries Supported - React, Vue, Svelte, Angular, jQuery, Axios, Tailwind, Bootstrap, and more. 📊 Real-Time License Analysis & Risk Ratings • SPDX Compliance - Matches dependencies against the official standardized SPDX license list database. • Project Compatibility Matrix - Instantly audits licenses against your target project license (MIT, Apache-2.0, GPL, LGPL, BSD, MPL, ISC, etc.). • Color-Coded Risk Indicators - Categorizes dependencies as Compatible (Low Risk), Review Required (Medium Risk), or Incompatible (High Risk). • Automated Normalization - Translates standard comment variations (e.g. GPL-3.0, LGPL-2.1) to official SPDX formats. • Plain-English Explanations - Provides clear, contextual explanations for why licenses are or aren't compatible. 🎨 Premium Dark Mode UI & UX • Glassmorphic Dashboard - Modern dark-theme dashboard designed with sleek HSL colors, backdrop blurs, and vector icon grids. • Slide-in Settings Overlay - Toggle configurations and change your target license via a smooth slide-in panel. • Live Compliance Badge - The extension badge icon displays the count of incompatible or review-required licenses dynamically. • Toast Micro-interactions - Animated feedback toast notifications (e.g. "Report exported successfully", "Auto-scan enabled"). • Accessibility (A11y) Focused - Styled focus outlines (:focus-visible) and keyboard navigation friendly. ⚙️ Optimization & Storage Control • Storage Pruning Policy - Automatically limits cached history to the 50 most recently scanned hostnames, keeping the extension footprint lightweight and preventing storage bloat. • Offline Capable - Uses local license database; works entirely offline with zero network latency. 🔒 PRIVACY & SECURITY • 100% Local Processing - All code parsing, global querying, and compatibility checks happen locally on your device. • Zero Data Collection - We do not track, collect, or store your browsing history, URLs, or personal data. • No External Callbacks - Completely independent, making no third-party analytics or API requests. • Open Source - Licensed under GPL-3.0 with publicly auditable source code. 🚀 HOW IT WORKS 1. Navigate to any website. 2. Click the extension icon in your toolbar (or enable Auto-Scan to view compliance risks dynamically). 3. View detected libraries, version numbers, detection methods, and risk ratings. 4. Select your project's license from the Settings panel to instantly recalculate compliance compatibility. 5. Export detailed findings as a standardized JSON compliance report. 🎓 SUPPORTED LICENSES & DEPENDENCIES Permissive Licenses: • MIT, Apache-2.0, BSD-2-Clause, BSD-3-Clause, ISC, Unlicense, CC0-1.0 Copyleft Licenses: • GPL-2.0-only, GPL-3.0-only, LGPL-2.1-only, LGPL-3.0-only, AGPL-3.0-only Weak Copyleft: • MPL-2.0, EPL-2.0, CDDL-1.0 Creative Commons: • CC-BY-4.0, CC-BY-SA-4.0 And many more SPDX-compliant licenses! 🎓 DETECTED LIBRARIES JavaScript Frameworks & Libraries: React, Vue.js, Angular, Svelte, jQuery, Lodash, Underscore, Moment.js, Date-fns, Axios, D3.js, Chart.js, Three.js, and more. CSS Frameworks: Bootstrap, Tailwind CSS, Material Design, Bulma, Foundation, Semantic UI, and more. Web Fonts & Icons: Google Fonts, Adobe Fonts, Font Awesome. 💡 USE CASES Development: • Verify licenses before copying code from examples. • Audit third-party dependencies on competitor sites. • Learn from real-world license implementations. Due Diligence: • Pre-acquisition license audits. • Compliance verification for existing projects. • Risk assessment for new dependencies. Education: • Teaching open-source licensing concepts. • Understanding license compatibility. • Real-world license examples. 🛠️ TECHNICAL DETAILS • Manifest V3 - Built with the latest Chrome extension standards. • Zero Dependencies - Self-contained, ultra-fast, and lightweight. • Automated DX Tests - Robust Node.js testing harness validation. 🤝 OPEN SOURCE PROJECT Developer License Detector is open source and licensed under GPL-3.0. We welcome contributions! • GitHub: https://github.com/mustafaer/developer-license-detector • Report Issues: https://github.com/mustafaer/developer-license-detector/issues • Contribute: See CONTRIBUTING.md in our repository. ⭐ SUPPORT THE PROJECT If you find this extension useful: • Leave a review on the Chrome Web Store. • Star the project on GitHub. • Report bugs and suggest features. • Share with fellow developers. 📧 CONTACT & SUPPORT • GitHub Issues: https://github.com/mustafaer/developer-license-detector/issues • Email: mustafaerpro@gmail.com --- Made with ❤️ for the developer community by Mustafa ER Helping developers navigate the complex world of open-source licensing, one web page at a time. DISCLAIMER: This tool provides compatibility assessments based on established legal precedents and guidelines, but does not constitute official legal advice. Consult with qualified legal counsel for licensing decisions.