A lightweight ComfyUI custom node pack to enable ViewComfy app functionalities like workflow branching, optional image inputs, input validations and custom errors.

This node pack has no extra dependencies beyond the standard ComfyUI ones. It can be added to any ComfyUI environment with no risk of breaking anything.

1. Compare

2. Conditional Select

3. Show Anything

4. Load Image

5. Anything Inversed Switch

6. Show Error Message

7. Save Text

8. Download and Save Video

Compares two inputs and returns a Boolean.

Supports multiple data types, including primitives, tensors (images or videos), Booleans, etc.

The default value for a and b is None

• a == b

• a != b

• a < b

• a > b

• a <= b

• a >= b

• a and b

• a or b

• Boolean

• Only == and != operators are supported for Tensor Comparison (e.g. Images and Videos)

• The and and or operations require both inputs to be boolean values.

• Comparing numeric values to control workflow branching

• Checking if tensors/images are identical

• Create custom input validations in ComfyUI workflows

Outputs one of two input values based on a boolean condition. This is essentially a programmatic if-else statement that works with any data type.

• A boolean value that determines which input to output. Default: True

• Values A and B. They can be of any type. Default: None

• Returns Value A if the condition is True, otherwise returns Value B.

• Selecting between different models, images, or parameters based on conditions.

• Implementing conditional logic in ComfyUI workflows.

A visualization node that displays any type of data in the ComfyUI interface. It can handle strings, lists, objects, and complex data structures by converting them to readable text format.

• Anything

• The input as a JSON string

• Can be used to display text in ViewComfy apps
• Debugging workflows by inspecting intermediate values
• Monitoring data flow through complex workflows

A variation of the Load Image node with optional image loading capability. This allows ComfyUI workflows to run even when the node is not pointing to any image.

• An Image. Default: "None"

• An image and/or a mask
• Returns None if no image is selected or if the file doesn't exist

• Unlike standard ComfyUI LoadImage, this node can work with "None" as input, returning None instead of raising an error.

• Build ViewComfy apps or ComfyUI based APIs with optional image inputs.

Routes a single input to one of multiple outputs (up to 10) based on an index value. All non-selected outputs are blocked from execution, making this useful for conditional execution paths.

• An index value to determine which output to route the input to. Default: 0

• The value to route to the selected output. This can be of any data type.

• Only the output at the position matching index will receive the input value

• All other outputs are blocked.

• Nodes downstream of non-selected outputs will not execute

• Creating ViewComfy apps with conditional execution paths based on a user selected index

• Routing data to different processing pipelines based on conditions

• Building switch/case-like logic in ComfyUI

Conditionally displays an error message and halts workflow execution.

• A boolean to control whether to raise an error or not. Default: True

• The first and second parts of the error message.

• An error showing both parts of the messages combined.

• Validating workflow inputs

• Creating conditional error messages based on workflow state

• Implementing user-friendly error handling in complex workflows

Save a string in the output folder as a text file.

• Any string

• Display text in a viewcomfy app

Downloads a video from a URL and saves it to the output directory. Designed to be fast and reliable when called via API, skipping the usual tensor conversion processes.

• A URL pointing to the video file
• A filename prefix for the downloaded video

• Saves the video file to the output directory

• The node does not display a video preview in the ComfyUI interface after downloading. The video will still appear in the ComfyUI history tab (left sidebar). This limitation only affects the ComfyUI interface and has no impact when using the node via API or in a ViewComfy app.
• Defaults to .mp4 if no extension can be determined from the URL or the MIME type

• Fast video downloads with no extra processes