What is Mitmproxy used for?

mitmproxy is a free and open source interactive HTTPS proxy that intercepts, inspects, modifies, and replays web traffic for debugging, testing, and penetration testing. It is a good fit for debugging and testing web applications, penetration testing, and privacy measurements.

Is Mitmproxy open source?

Yes. Mitmproxy is open source under the MIT licence. Its source code is on GitHub at mitmproxy/mitmproxy and is written mainly in Python.

Yes. Mitmproxy is open source, so the software itself is free to use.

Can I self-host Mitmproxy?

Yes. Mitmproxy can be self-hosted on your own server or infrastructure.

What is Mitmproxy an alternative to?

Mitmproxy is an open-source alternative to Fiddler, Proxyman and Charles Proxy. Other open-source alternatives to Fiddler include Insomnia, Wireshark and Requestly.

Is Mitmproxy actively maintained?

Yes. The most recent commit to Mitmproxy was on 13 October 2026, and the latest release is v12.2.3, published on 12 May 2026. The project has 46k stars on GitHub.

Mitmproxy: open-source alternative to Fiddler, Proxyman

About Mitmproxy

mitmproxy is an interactive HTTPS proxy that can intercept, inspect, modify, and replay web traffic including HTTP/1, HTTP/2, HTTP/3, WebSockets, and other SSL/TLS-protected protocols. It provides a command-line interface, a web interface called mitmweb, and a Python API via mitmdump.

It is designed for penetration testers and software developers. The tool supports prettifying and decoding various message types, intercepting specific messages on-the-fly, modifying them before they reach their destination, and replaying them to a client or server. It also has a scripting API for automating modifications, redirecting traffic, visualizing messages, and implementing custom commands.

Key features

Intercepts, inspects, modifies, and replays web traffic
Supports HTTP/1, HTTP/2, HTTP/3, WebSockets, and other SSL/TLS-protected protocols
Prettifies and decodes message types from HTML to Protobuf
Provides a graphical interface via mitmweb
Offers a Python scripting API via mitmdump
Has a community ecosystem of addons and tools

Good fit for

Debugging and testing web applications
Penetration testing
Privacy measurements

Built with: Python tools
Tags: proxy; https; intercept; debugging; testing; penetration-testing

Mitmproxy: questions and answers

What is Mitmproxy used for?: mitmproxy is a free and open source interactive HTTPS proxy that intercepts, inspects, modifies, and replays web traffic for debugging, testing, and penetration testing. It is a good fit for debugging and testing web applications, penetration testing, and privacy measurements.
Is Mitmproxy open source?: Yes. Mitmproxy is open source under the MIT licence. Its source code is on GitHub at mitmproxy/mitmproxy and is written mainly in Python.
Is Mitmproxy free?: Yes. Mitmproxy is open source, so the software itself is free to use.
Can I self-host Mitmproxy?: Yes. Mitmproxy can be self-hosted on your own server or infrastructure.
What is Mitmproxy an alternative to?: Mitmproxy is an open-source alternative to Fiddler, Proxyman and Charles Proxy. Other open-source alternatives to Fiddler include Insomnia, Wireshark and Requestly.
Is Mitmproxy actively maintained?: Yes. The most recent commit to Mitmproxy was on 13 October 2026, and the latest release is v12.2.3, published on 12 May 2026. The project has 46k stars on GitHub.