1. Install Node.js 22.6 or newer. Prepare a Comfy Developer Platform deployment with the patched h3_character_swap node pack, MiniMax H3, SAM 3.1 and the two LoRAs by following build/model-files.md. Cloning this repo does not create that deployment.

2. Copy this repository and make local settings:

   git clone https://github.com/Comfy-Org/comfy-openjutsu.git
   cd comfy-openjutsu
   cp .env.example .env.local
   

3. Add the API key for the workspace that owns your deployment to COMFY_API_KEY. Set COMFY_BASE_URL to the deployment URL from the Developer Platform; the SDK reads both variables from .env.local on the server.

4. Install and start the app:

   npm ci
   npm run dev
   

5. Open http://localhost:3000. Pick one of the examples, or choose a clip of one continuous shot with a person in its first frame, and a character image. Pick where the part starts and how long it is, then select Swap character.

The first job may take several minutes while the deployment starts and loads its models; a 5 second part at 480p took about two minutes on a warm worker. The server reads the key from .env.local; do not expose it in a NEXT_PUBLIC_ variable or commit the file.