Yanshuf
Open source on GitHub

Yanshuf

See every request your Mac sends.

Yanshuf shows the HTTP and HTTPS traffic on your Mac. Read a request, change it, and send it again. Free and open source.

Download for macOSView on GitHub
The Yanshuf capture view. It has three panes: the request list, the request details, and the response body.
The Yanshuf rules screen. It shows the Mock, Rewrite, Breakpoint, and Map Remote actions.

Rules

Change a request before it reaches the server.

A rule matches a URL with a regular expression. Yanshuf applies the first rule that matches, so the order of the rules is important.

  • Mock: return your own response and stop the request at Yanshuf.
  • Rewrite: change the request or the response, then send it on.
  • Breakpoint: hold the request, edit it, and then continue.
  • Map Remote: send the request to a different host. The path stays the same.
The Yanshuf Composer. It has a method field, a URL field, the headers, and the templates.

Composer

Build and send HTTP requests.

Write a new request in Composer, or drag a captured request into it. Yanshuf adds the result to the capture list.

  • Set the method, the URL, the headers, and the body.
  • Drag a request from the capture list into Composer.
  • Start from a GET or a POST template.
  • Copy the request as a cURL command.
The Yanshuf AI Integration settings. Cursor, the MCP server, the hooks, and the skills are connected.

AI Integration

Connect Cursor and Claude Code to Yanshuf.

Yanshuf includes a Model Context Protocol (MCP) server. Install it from Settings, and your AI tool can then read the captures and send requests.

  • Install the MCP server into your editor with one click.
  • Install hooks and skills for your agent at the same time.
  • Your agent can search the captures and read a response.
  • The API listens on localhost only, and it needs a token.

Open source

If you don't like something, fork it.

~/code

$ gh repo fork sefi-uzan/yanshuf --clone

✓ Cloned yanshuf into ./yanshuf

$ cd yanshuf && pnpm install

✓ Packages installed in 4.2s

$ pnpm start

▲ Yanshuf dev server → Electron app launched

  • Change the interface. Make the app look the way you want.
  • Add your own rules and tools. You have all of the code.
  • Build the app yourself. Give your build to your team.

MIT licensed · macOS only

Fork on GitHubBrowse source ↗

Stop guessing. Look at the traffic.

Yanshuf is free and open source. Install it, trust the Yanshuf root certificate, and enable capture.

Download for macOSView on GitHub