mj

mj drives Midjourney's web app from Go. It is a command-line tool and an MCP server for AI agents. It uses your own Midjourney account. There is no Discord bot and no account pool.

Under the hood it drives a real Camoufox browser through gomoufox, so every request to midjourney.com and the result CDN goes out the way a logged-in browser does. That is the only path that clears Cloudflare.

Warning

Midjourney's Terms of Service prohibit automated access: "You may not use automated tools to access, interact with, or generate Assets through the Services." Accounts have been banned for it. mj is bring-your-own-account only. Your account, your risk. It ships a conservative submit throttle, backs off when the server rate-limits you, and refuses to generate until you pass --i-understand once. Run it at low volume.

At a glance

You want to	Use
Generate images from a terminal or script	mj imagine "..."
Give an AI agent image tools	mj-mcp (25 tools)
Search and pull from the community gallery	mj search, mj explore
Edit an image (zoom out, pan, inpaint, restyle)	mj zoom, mj pan, mj vary-region, mj retexture
Watch a job render live	mj imagine "..." --watch
Share one warm browser across many calls	mj serve

Install

You need Go 1.26 or newer. On first run, gomoufox downloads a managed Camoufox browser (a Python venv plus a Firefox binary, about 300 to 660 MB). That happens once.

Install with Homebrew:

brew install ehmo/mj/mj

Or install the two binaries with Go:

go install github.com/ehmo/mj/cmd/mj@latest
go install github.com/ehmo/mj/cmd/mj-mcp@latest

Or build from a clone:

git clone https://github.com/ehmo/mj && cd mj
go build -o mj ./cmd/mj
go build -o mj-mcp ./cmd/mj-mcp

Check the toolchain:

mj doctor

Log in once

mj login --i-understand

A browser window opens. Sign in with Google or Discord, wait for the Create page to load, then press Enter in the terminal. mj saves the session to a local profile. If you have hasp, it also stores the Firebase refresh token in your vault. The token never lands in mj's own config.

First image

mj imagine "a vintage teal bicycle on a pink wall --ar 3:2" --wait --download ./out

This submits one job (a 4-image grid), waits for it to finish, and saves the four cells plus the grid to ./out. Add --json for machine output.

Want to watch it render? Swap --wait for --watch:

mj imagine "a koi in dark water" --watch --download ./out

You get a live percentage from 0 to 100 over Midjourney's WebSocket.

When to use what

Use the CLI when you drive Midjourney yourself, from a shell, a script, or a cron job. Pipe --json into jq and you have a generation pipeline.

Use the MCP server when an agent should drive Midjourney. Claude (or any MCP client) gets 25 tools: generate, vary, upscale, animate, search, edit, download, and a raw escape hatch.

Use the daemon when you make many calls. Each one-off command cold-starts a browser, which costs about 4 to 6 seconds. A warm daemon shares one browser and one session, so calls drop to under a second.

Use cases

1. Generate from a script

for p in "red maple leaf" "blue spruce cone" "golden ginkgo"; do
  mj imagine "$p, white background, studio light --ar 1:1" --wait --download ./botany --json \
    | jq -r '.images[]'
done

Each line of output is a CDN URL. The files land in ./botany.

2. Let an agent make images

Register the server with Claude Code:

claude mcp add midjourney -- mj-mcp

Now ask the agent in plain language: "Generate three logo options for a coffee brand, then upscale the one with the cleanest type." The agent calls midjourney_imagine, reads the result, and calls midjourney_upscale. See docs/mcp.md for the full tool list and a worked transcript.

3. Mine the community gallery

mj search "brutalist concrete interior, soft light" --limit 12 --download ./refs
mj explore --feed top_week --limit 20
mj styles                      # browse --sref style codes

Search runs Midjourney's semantic vector search. Every result carries the full prompt and flags that made it, so you can reproduce or remix it.

4. Edit an existing image

mj zoom        photo.png "a wider establishing shot" --factor 2 --wait --download ./out
mj pan         photo.png "more sky"  --dir up --amount 0.5 --wait --download ./out
mj vary-region photo.png "a golden crown" --region 300,40,420,300 --wait --download ./out
mj retexture   photo.png "oil painting, thick impasto" --ar 1:1 --wait --download ./out

mj composites the edit the same way Midjourney's web editor does, then submits it. The source can be a local file or a URL.

5. Animate a still

JOB=$(mj imagine "a paper boat on a calm pond --ar 16:9" --wait --json | jq -r .job_id)
mj video "$JOB" --index 1 --motion low --wait --download ./clips

Videos download in bounded-memory chunks, so a long clip does not balloon memory.

CLI

Every command takes --json. Data goes to stdout, progress and warnings go to stderr, so pipes stay clean. Exit codes separate auth failures (3), job failures (4), timeouts (5), and Cloudflare blocks (6) from generic errors (1).

Generate   imagine  vary  upscale  reroll  video
Edit       describe  retexture  zoom  pan  outpaint  vary-region
Discover   search  explore  likes  styles  profile  uploads  liked-styles
           folders  profiles  queue  moodboards
Jobs       status  wait  watch  history  download
Account    login  logout  account  auth  doctor
Daemon     serve  daemon
Raw        api

Run mj help <command> for focused help on any of them. Full reference: docs/cli.md.

Generation flags map straight to Midjourney parameters:

--ar W:H   --version 7|8|8.1|niji 6|niji 7   --mode fast|relax|turbo   --stealth
--stylize 0..1000   --chaos 0..100   --weird 0..3000   --quality 0.25|0.5|1|2|4
--seed N   --no a,b   --tile   --stop 10..100   --style-raw   --raw "..."
--sref U --sw N --sv N    --oref U --ow N    --cref U --cw N    --profile ID
--image FILE|URL (repeatable; local files upload first)

--mode relax|turbo and --stealth need an eligible plan. mj checks your plan before it submits, so you get a clear error instead of a wasted job.

MCP

mj-mcp speaks MCP over stdio, so it works with any MCP client.

Claude Code:

claude mcp add midjourney -- mj-mcp

Codex, in ~/.codex/config.toml:

[mcp_servers.midjourney]
command = "mj-mcp"

Cursor, Windsurf, or any other stdio client, in its MCP config:

{ "mcpServers": { "midjourney": { "command": "mj-mcp" } } }

It exposes 25 tools:

imagine  variation  upscale  reroll  video        (generate)
describe retexture  zoom  pan  vary_region         (edit)
search   explore  likes  styles  profile  uploads  (discover)
folders  profiles  queue  moodboards               (account)
status   history  account  download  api           (jobs / raw)

It runs one generation at a time. It reads status, runs searches, and cancels work while a generation is in flight, so the agent is never blocked. It refuses to start until you have run mj login --i-understand.

Agent safety

An agent's input can be hostile (prompt injection from a web page or an image). The MCP surface is locked down for that:

• image arguments must be public https URLs. Local paths are refused unless you set MJ_MCP_FILE_ROOT=/some/dir, and then only files under that directory. This stops "describe this image: /home/you/.ssh/id_rsa" from uploading your files to a third party.
• URLs that point at private, loopback, or cloud-metadata hosts are blocked.
• midjourney_api (the raw endpoint) is read-only unless you set MJ_MCP_ALLOW_RAW_WRITE=1.

Full tool reference, schemas, and an example agent session: docs/mcp.md.

Daemon

mj serve                  # warm browser; keep it running (or background it)
mj daemon status          # running (…/mj/daemon.sock)
mj search "cat"           # ~0.3s instead of ~5s
mj daemon stop

Commands route to the daemon when it runs and fall back to a one-off browser when it does not. The daemon throttles generations across every client, CLI and MCP together, through one session. That is faster and safer for your account than two clients submitting in parallel.

Set daemon_autostart: true in config (or MJ_DAEMON_AUTOSTART=1) and the first command spawns a background daemon for you.

Ban safety

Automating Midjourney risks your account. mj does what it can to keep the risk low:

• A minimum gap between submits (12s by default), enforced at one choke point so even the raw api tool cannot skip it.
• Adaptive backoff: a 429 grows the gap and a success shrinks it again.
• One submit funnel through the daemon, shared by every client.
• The ToS gate (--i-understand), stored once.

None of this makes automation safe. It makes it slower, which is the point. Set a larger gap with --throttle or the throttle_secs config if you want more headroom. Watch traffic with MJ_DEBUG=1, which logs every API call (method, path, status, timing) with tokens redacted.

Credentials

mj reads the Firebase refresh token from, in order:

1. MIDJOURNEY_FIREBASE_REFRESH_TOKEN (use hasp inject … -- mj … to broker it).
2. The local browser profile after mj login.

It never writes the token to its own config. mj logout removes the local session and deletes the stored token.

Documentation

• docs/cli.md: every command, flag, and example.
• docs/mcp.md: every MCP tool, its schema, and an agent transcript.
• SECURITY.md: trust boundaries and how to report an issue.
• CONTRIBUTING.md: build, test, and the bar for changes.

License

MIT, copyright Wraxle LLC. See LICENSE.

Camoufox is MPL-2.0 and runs as a subprocess, downloaded at runtime, not vendored. gomoufox and playwright-go are MIT.

This is an unofficial, independent project. It is not affiliated with Midjourney, and Midjourney has not endorsed it.