Midjourney MCP Web

Unofficial Model Context Protocol (MCP) server for generating images through the Midjourney web app using your own signed-in browser authentication cookies.

This project is a cleaned-up and modernized fork of Lala-0x3f/mj-mcp. It keeps the same simple MCP surface, but updates the web flow for the current Midjourney site:

• submits jobs to /api/submit-jobs

• reads the Midjourney user id from the signed-in web page

• polls /api/imagine instead of relying on the now-blocked websocket path

• defaults to --v 8.1

This project is not affiliated with, endorsed by, or supported by Midjourney.

Tool

The server exposes one MCP tool:

generating_image(prompt: str, aspect_ratio: str) -> str

The response is Markdown with four Midjourney CDN image URLs.

Requirements

• Python 3.10+

• uv or another Python package runner

• A Midjourney account with access to the web app

• Your own __Host-Midjourney.AuthUserTokenV3_r and __Host-Midjourney.AuthUserTokenV3_i cookie values

Install From GitHub

uvx --from git+https://github.com/WilliamJizh/midjourney-mcp-web midjourney-mcp-web

For local development:

git clone https://github.com/WilliamJizh/midjourney-mcp-web.git
cd midjourney-mcp-web
uv run --with-editable . python -m midjourney_mcp_web

Configuration

The server reads configuration from environment variables.

Never commit real token values. Treat both tokens as secrets.

Codex Config Example

[mcp_servers.midjourney]
command = "uvx"
args = ["--from", "git+https://github.com/WilliamJizh/midjourney-mcp-web", "midjourney-mcp-web"]

[mcp_servers.midjourney.env]
TOKEN_R = "replace_with_midjourney_cookie_r"
TOKEN_I = "replace_with_midjourney_cookie_i"
SUFFIX = "--v 8.1"

For better local security on macOS, store the tokens in Keychain and use a small wrapper script that exports TOKEN_R and TOKEN_I before launching this server. Do not publish that wrapper with real values.

Claude Desktop Config Example

{
  "mcpServers": {
    "midjourney": {
      "command": "uvx",
      "args": [
        "--from",
        "git+https://github.com/WilliamJizh/midjourney-mcp-web",
        "midjourney-mcp-web"
      ],
      "env": {
        "TOKEN_R": "replace_with_midjourney_cookie_r",
        "TOKEN_I": "replace_with_midjourney_cookie_i",
        "SUFFIX": "--v 8.1"
      }
    }
  }
}

Getting Cookie Values

1. Open https://www.midjourney.com/explore?tab=top while signed in.

2. Open browser developer tools.

3. Go to Application or Storage.

4. Open Cookies for https://www.midjourney.com.

5. Copy the values for:

   • __Host-Midjourney.AuthUserTokenV3_r

   • __Host-Midjourney.AuthUserTokenV3_i

Do not paste these values into public chats, issues, logs, or commits.

Example Prompt

A peaceful impressionist garden with water lilies and soft morning light --stylize 200

Call the MCP tool with:

{
  "prompt": "A peaceful impressionist garden with water lilies and soft morning light --stylize 200",
  "aspect_ratio": "3:4"
}

The server appends:

--ar 3:4 --v 8.1

unless you override SUFFIX.

Development

uv run --extra dev pytest
uv run --extra dev python -m build

Run a no-secret source scan before publishing:

git grep -n -I -E 'TOKEN_R=|TOKEN_I=|AuthUserTokenV3_[ri]=[^\"[:space:]]+|gho_|sk-[A-Za-z0-9]|BEGIN (RSA|OPENSSH|PRIVATE) KEY'

Limitations

• Midjourney web APIs are not public APIs and may change without notice.

• The server uses your own Midjourney account and may consume GPU time.

• The returned URLs point to Midjourney CDN assets.

• This does not upload reference images; it is text-prompt only.

License

GPL-3.0-or-later. See LICENSE.