ComfyUI Custom Node Packaging

How to structure, register, and publish a custom node package.

Project Structure

ComfyUI/custom_nodes/
  my_custom_nodes/
    __init__.py            # Entry point (required)
    nodes.py               # Node class definitions
    requirements.txt       # Python dependencies
    pyproject.toml         # Package metadata
    README.md              # Documentation
    js/                    # Frontend extensions (optional)
    │   └── my_extension.js
    docs/                  # Help pages (optional)
    │   └── MyNode.md
    locales/               # i18n translations (optional)
        └── zh/
            └── main.json

Entry Point: init.py

V3 Registration (Recommended)

# __init__.py
from typing_extensions import override
from comfy_api.latest import ComfyExtension, io

from .nodes import MyNode1, MyNode2, MyNode3

WEB_DIRECTORY = "./js"  # optional: frontend JS extensions

class MyNodesExtension(ComfyExtension):
    @override
    async def get_node_list(self) -> list[type[io.ComfyNode]]:
        return [MyNode1, MyNode2, MyNode3]

    @override
    async def on_load(self):
        # Optional: run initialization logic when extension loads
        pass

async def comfy_entrypoint() -> MyNodesExtension:
    return MyNodesExtension()

V1 Registration (Legacy)

# __init__.py
from .nodes import MyNode1, MyNode2

NODE_CLASS_MAPPINGS = {
    "MyNode1": MyNode1,
    "MyNode2": MyNode2,
}

NODE_DISPLAY_NAME_MAPPINGS = {
    "MyNode1": "My Node 1",
    "MyNode2": "My Node 2",
}

WEB_DIRECTORY = "./js"

__all__ = ["NODE_CLASS_MAPPINGS", "NODE_DISPLAY_NAME_MAPPINGS", "WEB_DIRECTORY"]

Node Definitions File

# nodes.py
import torch
from comfy_api.latest import io

class MyNode1(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="MyNode1_UniqueID",   # globally unique
            display_name="My Node 1",
            category="my_nodes",
            description="Does something useful",
            inputs=[
                io.Image.Input("image"),
                io.Float.Input("value", default=1.0, min=0.0, max=10.0),
            ],
            outputs=[io.Image.Output("IMAGE")],
        )

    @classmethod
    def execute(cls, image, value):
        return io.NodeOutput(image * value)

Dependencies: requirements.txt

# requirements.txt
opencv-python>=4.8.0
requests>=2.28.0

Important: Only list dependencies not already included with ComfyUI. ComfyUI ships with: torch, torchvision, torchaudio, numpy, PIL/Pillow, scipy, safetensors, transformers, accelerate.

pyproject.toml

[project]
name = "comfyui-my-nodes"
version = "1.0.0"
description = "My custom nodes for ComfyUI"
license = "MIT"
requires-python = ">=3.10"

[project.urls]
Repository = "https://github.com/username/comfyui-my-nodes"

Frontend Extensions (JavaScript)

Place .js files in the WEB_DIRECTORY:

my_custom_nodes/
  js/
    my_widgets.js      # Custom widget implementations
    my_extension.js    # Extension hooks

# __init__.py
WEB_DIRECTORY = "./js"

All .js files in this directory are loaded by the frontend automatically. CSS and other resources can be accessed at extensions/my_custom_nodes/filename.css.

Help Pages

Create markdown documentation per node:

my_custom_nodes/
  docs/
    MyNode1.md         # filename matches node_id

<!-- docs/MyNode1.md -->
# My Node 1

Processes images with adjustable value.

## Inputs
- **image**: The input image
- **value**: Processing strength (0.0 - 10.0)

## Outputs
- **IMAGE**: The processed image

Internationalization (i18n)

my_custom_nodes/
  locales/
    zh/
      main.json
      nodeDefs.json    # node definition translations

// locales/zh/nodeDefs.json
{
    "MyNode1_UniqueID": {
        "display_name": "我的节点1",
        "description": "处理图像",
        "inputs": {
            "image": { "display_name": "图像" },
            "value": { "display_name": "数值", "tooltip": "处理强度" }
        }
    }
}

Single-File Node

For very simple nodes, everything can be in one file:

# ComfyUI/custom_nodes/my_simple_node.py
import torch
from comfy_api.latest import ComfyExtension, io
from typing_extensions import override

class InvertImage(io.ComfyNode):
    @classmethod
    def define_schema(cls):
        return io.Schema(
            node_id="SimpleInvert",
            display_name="Simple Invert",
            category="image",
            inputs=[io.Image.Input("image")],
            outputs=[io.Image.Output("IMAGE")],
        )

    @classmethod
    def execute(cls, image):
        return io.NodeOutput(1.0 - image)


class SimpleExtension(ComfyExtension):
    @override
    async def get_node_list(self):
        return [InvertImage]

async def comfy_entrypoint():
    return SimpleExtension()

Key Imports

# V3 API core
from comfy_api.latest import ComfyExtension, io, ui
from comfy_api.latest import ComfyAPI          # async runtime API (use with await)
from comfy_api.latest import ComfyAPISync      # sync runtime API (use in sync execute)
from comfy_api.latest import Input             # Input.Image, Input.Audio, Input.Mask, Input.Latent, Input.Video
from comfy_api.latest import InputImpl         # InputImpl.VideoFromFile, InputImpl.VideoFromComponents
from comfy_api.latest import Types             # Types.MESH, Types.VOXEL, Types.File3D, Types.VideoCodec
from typing_extensions import override

# Common utilities
import folder_paths                            # directory management
from server import PromptServer                # server-to-client messaging
from comfy_execution.graph_utils import GraphBuilder  # node expansion

Using folder_paths

ComfyUI provides folder_paths for accessing standard directories:

import folder_paths

# Standard directories
input_dir = folder_paths.get_input_directory()
output_dir = folder_paths.get_output_directory()
temp_dir = folder_paths.get_temp_directory()

# Model directories
checkpoint_paths = folder_paths.get_folder_paths("checkpoints")
lora_paths = folder_paths.get_folder_paths("loras")

# Register custom model folder
folder_paths.add_model_folder_path("my_models", "/path/to/models")

# Get model file list
models = folder_paths.get_filename_list("checkpoints")

Publishing to ComfyUI Registry

1. Create pyproject.toml

[project]
name = "comfyui-my-nodes"
version = "1.0.0"
description = "My custom nodes"
license = "MIT"

[tool.comfy]
PublisherId = "your-publisher-id"

2. Publish

comfy node publish

CI/CD with GitHub Actions

# .github/workflows/publish.yml
name: Publish to ComfyUI Registry
on:
  push:
    tags:
      - 'v*'
jobs:
  publish:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: '3.12'
      - run: pip install comfy-cli
      - run: comfy node publish
        env:
          COMFY_API_KEY: ${{ secrets.COMFY_API_KEY }}

Scaffolding with comfy-cli

# Install comfy-cli
pip install comfy-cli

# Create new custom node project
cd ComfyUI/custom_nodes
comfy node scaffold

This generates the boilerplate structure with all necessary files.

Node ID Best Practices

• Use a globally unique prefix: "MyProject_NodeName" or "username.NodeName"
• Never change node_id after release (breaks saved workflows)
• Use display_name for user-facing name changes
• Use search_aliases for discoverability: search_aliases=["alias1", "alias2"]

Common Patterns

Organizing Multiple Node Files

# __init__.py
from typing_extensions import override
from comfy_api.latest import ComfyExtension, io

from .image_nodes import BlurNode, SharpenNode, ResizeNode
from .text_nodes import ConcatNode, FormatNode
from .util_nodes import SwitchNode, DebugNode

class MyExtension(ComfyExtension):
    @override
    async def get_node_list(self):
        return [
            BlurNode, SharpenNode, ResizeNode,
            ConcatNode, FormatNode,
            SwitchNode, DebugNode,
        ]

async def comfy_entrypoint():
    return MyExtension()

Conditional Node Loading

class MyExtension(ComfyExtension):
    @override
    async def get_node_list(self):
        nodes = [BasicNode]
        try:
            import cv2
            from .opencv_nodes import OpenCVNode
            nodes.append(OpenCVNode)
        except ImportError:
            pass
        return nodes

See Also

• comfyui-node-basics - Node class structure
• comfyui-node-frontend - JavaScript extension details
• comfyui-node-migration - V1 to V3 migration