ComfyUI/frontend_extensions/missingModelsDownloader

Missing Models Downloader for ComfyUI

This extension adds automatic download functionality to ComfyUI's "Missing Models" dialog, allowing users to download missing models directly from the interface with a single click.

Features

• Automatic Download Buttons: Adds a "Download" button next to each missing model in the dialog
• Known Model Repository: Pre-configured URLs for popular models (SDXL, SD1.5, VAEs, LoRAs, ControlNet, etc.)
• Custom URL Support: Prompts for URL if model is not in the repository
• Real-time Progress: Shows download percentage directly in the button
• Bulk Downloads: "Download All" button for multiple missing models
• Smart Detection: Automatically detects model type and places files in correct folders

Installation

For ComfyUI Frontend Repository

If you're using the separate ComfyUI frontend repository:

1. Clone the frontend repository:

git clone https://github.com/Comfy-Org/ComfyUI_frontend.git
cd ComfyUI_frontend

2. Copy this extension to the extensions folder:

cp -r path/to/frontend_extensions/missingModelsDownloader web/extensions/

3. Build and run the frontend as usual

For ComfyUI with Built-in Frontend

If your ComfyUI still has the built-in frontend:

1. Copy the extension files to ComfyUI's web extensions:

cp -r frontend_extensions/missingModelsDownloader ComfyUI/web/extensions/core/

2. Restart ComfyUI

Backend Requirements

The backend (ComfyUI server) must have the model downloader API endpoints installed. These are included in the easy-download branch or can be added manually:

1. Ensure app/model_downloader.py exists
2. Ensure comfy_config/download_config.py exists
3. Ensure server.py includes the download API endpoints

How It Works

1. When ComfyUI shows the "Missing Models" dialog, the extension automatically detects it
2. Each missing model gets a "Download" button
3. For known models, clicking downloads immediately from the pre-configured source
4. For unknown models, you'll be prompted to enter the download URL
5. Download progress is shown as a percentage in the button
6. Once complete, the model is ready to use (refresh the node to see it)

Supported Model Sources

The extension includes pre-configured URLs for models from:

• HuggingFace: Stable Diffusion models, VAEs, LoRAs
• GitHub: Upscale models (ESRGAN, RealESRGAN)
• ComfyAnonymous: Flux text encoders

Configuration

Edit missingModelsDownloader.js to add more models to the repository:

this.modelRepositories = {
    "checkpoints": {
        "your_model.safetensors": "https://url/to/model"
    }
}

API Endpoints

The extension uses these backend API endpoints:

• POST /api/models/download - Start a download
• GET /api/models/download/{task_id} - Check download status
• POST /api/models/download/{task_id}/cancel - Cancel a download

Troubleshooting

If the download buttons don't appear:

1. Check the browser console for errors
2. Ensure the backend API endpoints are working: curl http://localhost:8188/api/models/downloads
3. Verify the extension is loaded (should see [MissingModelsDownloader] in console)

License

MIT