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.