Reqpane

Reqpane is a powerful Chrome extension for developers to capture, analyze, and debug API calls directly from the browser's side panel. FEATURES Request Capture • Intercepts all fetch() and XMLHttpRequest calls automatically • Captures complete request/response headers and bodies • Tracks request duration, status codes, and timing • Records console errors, unhandled rejections, and console.error() calls Smart Filtering • Filter by: All requests, Errors (4xx/5xx), Slow (>1s), Console errors • URL pattern search to find specific endpoints • Body content search across request and response payloads Multiple View Modes • List View - Chronological request list • Timeline View - Visual timeline with duration bars • Grouped View - Requests organized by domain Advanced Debugging • Request Comparison - Select two requests for side-by-side diff • Mock Responses - Define custom responses with URL patterns • Breakpoints - Pause requests before sending, continue or cancel Export Options • HAR format - Standard HTTP Archive for browser dev tools • Postman Collection - Import directly into Postman • Claude Prompt - Formatted for AI debugging assistance • Sessions - Save and restore request history Customization • Dark mode support • Adjustable font size (small/medium/large) • Favorite frequently accessed requests PRIVACY • All data stays local in your browser • No external servers or tracking • Requests are stored per-tab and cleared on navigation Perfect for frontend developers, API integrators, QA engineers, and anyone who needs to debug network requests efficiently.