James VeitchandClaude Sonnet 4.6
aec8609de9
app/frontend_management.py imports requests but the tag's requirements.txt omits it. Add explicit pip install so the image build is self-contained. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
comfydv
A collection of workflow efficiency and quality-of-life nodes built out of necessity for personal ComfyUI use.
What is this?
comfydv fills gaps in ComfyUI's built-in node library: dynamic string formatting, seed-controlled random selection, and graceful workflow interruption. Install it once and connect the nodes like any other — no Python knowledge required.
| Node | What it does |
|---|---|
| Format String | Formats a string from a Python f-string or Jinja2 template. Detects variables in the template and automatically adds/removes input sockets. |
| Random Choice | Accepts any number of typed inputs and outputs one at random, with a configurable seed for reproducibility. |
| Circuit Breaker | Halts the current ComfyUI queue run gracefully (raises InterruptProcessingException) without crashing the server. |
Install
-
Clone this repo into your ComfyUI
custom_nodes/directory:cd /path/to/ComfyUI/custom_nodes git clone https://github.com/darth-veitcher/comfydv.git -
Restart ComfyUI. The nodes appear under the dv/ category in the node menu.
Dependencies (
jinja2,rich,colorama,termcolor) are listed inpyproject.toml. ComfyUI's Python environment must have them installed — runpip install jinja2 rich colorama termcolorinside that environment if they are missing.
Quickstart
Format String — simple f-string:
- Add a Format String node to your workflow.
- Set
template_typetoSimpleand enterHello {name}in the template field. - A
nameinput socket appears automatically — wire it up or type a value. - Output 0 (
formatted_string) containsHello <your value>.
Random Choice:
- Add a Random Choice node.
- Connect any number of inputs (strings, images, conditioning — any type).
- Set
seedfor reproducibility; leave at0for a different pick each run. - Output is whichever input was selected.
Documentation
Full documentation can be found: darth-veitcher.github.io/comfydv
String Formatting
The FormatString node provides flexible string formatting with dynamic input/output configuration.
Python F-String
A simple python f-string dynamically creates the necessary inputs/outputs for the detected keys.
Jinja 2
Switching to Jinja2 allows you to use more advanced control blocks and other filters/features of that templating language. See Jinja documentation for further details.
Output Structure
The node's outputs are organized for maximum reliability and flexibility:
formatted_string(Output 0): The formatted result string - always in position 0saved_file_path(Output 1): Path to saved state file (if save_path provided) - always in position 1- Variable outputs (Output 2+): Pass-through values for any variables detected in the template, enabling easy chaining
For example, with template "Hello {name}, you are {age}":
- Output 0: The formatted string (e.g., "Hello Alice, you are 30")
- Output 1: The save file path (or empty string)
- Output 2: The value of
name(e.g., "Alice") - Output 3: The value of
age(e.g., "30")
This structure ensures the primary outputs (formatted_string and saved_file_path) are always in predictable, fixed positions for reliable workflow connections.
Random Choice
Ability to take arbitrary length and type of inputs to then output a choice with a controllable seed.
