API Request Sniffer

Capture and inspect all API requests (fetch/XHR) from any webpage with a clean, developer-friendly UI

API Request Sniffer - API Debugging Tool Tired of digging through Chrome DevTools Network tab? API Request Sniffer gives you a clean, focused interface to capture, analyze, and compare all API requests (fetch & XMLHttpRequest) from any webpage in real-time — without leaving your browser. KEY FEATURES Real-Time API Interception • Automatically captures all fetch() and XMLHttpRequest calls • Works without breaking page functionality • No manual setup required - just install and browse Filtering & Search • Filter by HTTP method (GET, POST, PUT, DELETE, etc.) • Filter by status code (2xx, 3xx, 4xx, 5xx) • Full-text search across URLs, request bodies, and responses • Date range filtering for historical analysis Performance Analytics Dashboard • Identify slowest endpoints at a glance • Detect APIs with high error rates (>10%) • Track most frequently called endpoints • Visual charts for status code and method distribution Request Comparison Tool • Side-by-side diff comparison of any two requests • Color-coded changes (added, removed, modified) • Compare headers, request bodies, and response bodies Custom API Requests • Make custom API calls directly from the extension • Full support for authentication headers (Bearer tokens, API keys) • Test external APIs without modifying your webpage Templates & History • Save frequently used requests as templates • Persistent storage across browser sessions • One-click template reuse Export Capabilities • Export to Postman Collection (v2.1) • Export to JSON for custom processing • Import directly into Postman for collaboration Developer-Friendly UI • Dark mode support • Virtualized list rendering (handles 1000s of requests) • Detachable window mode (stays open while browsing) • Syntax-highlighted JSON viewer • Copy as cURL command • GraphQL detection and highlighting HOW IT WORKS 1. Install the extension 2. Click the extension icon or use the "Detach" button for a separate window 3. Browse any website - API calls are automatically captured 4. Use filters, search, and analytics to analyze requests 5. Click any request to view full details (headers, body, response) 6. Compare, export, or save as template PRIVACY & SECURITY All captured data stays local in your browser. Nothing is sent to external servers, no tracking, and no analytics collection. The extension requests only the permissions required for its functionality. Open source - inspect the code yourself. SUPPORT & FEEDBACK Developed by Darshit Gajjar. Found a bug or have a feature request? • GitHub: gajjardarshithasmukhbhai/API-Sniffer-Chrome-Extension • Report issues, suggest features, or contribute code If you find this extension useful, please leave a review - your feedback helps improve it.