James has been discontinued. Similar apps include Fiddler, which has a free version. Other options are mitmproxy, Charles, Proxyman and Zed Attack Proxy (ZAP). You can choose from more than 10 HTTP(S) Debuggers like James for Mac, Windows, Linux, iPhone and iPad.
Web Debugging Proxy that logs all HTTP(S) traffic for comprehensive analysis. It allows manipulation of traffic, supports scripting, and extends with .NET. Debugs virtually any application, implementing man-in-the-middle interception with self-signed certificates. Freeware, ideal for developers.
United States
mitmproxy is an SSL-capable man-in-the-middle proxy for HTTP. It provides a console interface that allows traffic flows to be inspected and edited on the fly. It also features mitmdump, a commandline tool that provides a tcpdump-like interface for saving, viewing and...
Charles is an HTTP proxy / HTTP monitor / Reverse Proxy that enables a developer to view all of the HTTP and SSL / HTTPS traffic between their machine and the Internet. This includes requests, responses and the HTTP headers (which contain the cookies and caching information).
New Zealand
Monitor, intercept and debug HTTP/HTTPS and WebSocket traffic on macOS, iOS, Windows, and Linux. Includes advanced features such as Breakpoint, Map Local/Remote, scripting, filtering, reverse proxy, DNS spoofing, and automation for backend development.
United States
The Zed Attack Proxy (ZAP) is an easy to use integrated penetration testing tool for finding vulnerabilities in web applications.
Open-source native macOS HTTP debugging proxy — intercept HTTPS, inspect APIs, mock responses, debug WebSocket & GraphQL. Community-driven. For developers, by developers.
HTTP Debugger captures and decrypts HTTP/HTTPS from any Windows app without proxy setup — HTTP/2, WebSocket, SSE, gRPC and localhost included. Edit and replay requests, modify traffic on the fly, and let an AI assistant read the session over the built-in MCP server.
HTTP Scoop is a Mac network sniffer that displays requests to websites along with the response, and makes it fairly easy to see what's going on.
Modern HTTP debugging tool, Debug, mock, and rewrite HTTP/HTTPS traffic with composable rules.
United States
Easy, intuitive yet powerful HTTP(S) debugging proxy for macOS, Windows and Linux — capture, inspect, mock, break and replay traffic.
Germany
EU
