NetSniffer

About

NetSniffer is a powerful network traffic analyzer for developers, QA engineers, and security professionals. Inspired by Wireshark, it provides deep visibility into HTTP/HTTPS traffic directly in your browser.

KEY FEATURES

Network Capture
- Real-time packet capture using Chrome DevTools Protocol
- Support for XHR, Fetch, WebSocket, and all resource types
- Per-tab isolation - each tab has its own capture session
- Ring buffer prevents memory bloat (configurable limit)

Packet Inspection
- View request and response headers
- Inspect request/response bodies with syntax highlighting
- JSON viewer with collapsible tree structure
- Smart decode for encoded payloads (Base64, URL encoding, JWT, etc.)
- Timing breakdown (DNS, Connect, SSL, TTFB, Download)
- Security analysis for requests

Filtering & Search
- Advanced filter syntax (status:200, method:POST, domain:api.example.com)
- Regex support for complex patterns
- Quick filters for common scenarios
- Search across all captured packets

Developer Tools
- Request replay - resend captured requests
- Modify and replay - edit requests before resending
- API Client - build and send custom requests
- Mock responses - intercept and mock API responses
- Export to cURL, fetch, axios code snippets
- HAR export for compatibility with other tools

Quality of Life
- Bookmarks with color coding
- Annotations for collaborative debugging
- Session comparison
- Keyboard shortcuts
- Auto-pause on error detection
- Performance indicators (HTTP/2, HTTP/3, cache hits)

PRIVACY FOCUSED
- All data stays on your device
- No analytics or tracking
- No external data transmission
- Full control over your captured data

PERFECT FOR
- Frontend developers debugging API calls
- Backend developers testing endpoints
- QA engineers validating network behavior
- Security professionals analyzing traffic
- Anyone who needs visibility into browser network activity

NetSniffer brings professional-grade network analysis to your browser with a sleek, cyberpunk-inspired interface.