DumasNodes

DumasNodes is a ComfyUI custom-node pack for generic utility workflows under the Dumas brand.

Included Nodes

• Dumas Image Compare

  • Inputs: optional image1, optional image2
  • Outputs: new image
  • Saves preview images for the built-in compare UI and passes through the second image when present, otherwise the first.
  • Bundles a js/ frontend extension so the compare viewer renders inside both classic ComfyUI and Nodes 2.0.

• Save Image Dumas

  • Inputs: images, folder, pattern, format, quality, embed_workflow, save_on_run, optional name, optional name_2
  • Output: none
  • Saves images to any folder, not just ComfyUI's output directory.
  • Supports filename tokens including %input%, %input2%, %date:yyyy-MM-dd%, %counter%, %width%, %height%, and %batch_num%.

• Dumas JSON String to Object

  • Input: json_string
  • Output: parsed JSON
  • Use it to turn raw JSON text into a structured object.

• Dumas JSON Object to String

  • Inputs: json_object, pretty, sort_keys
  • Output: serialized STRING
  • Use it to compact or pretty-print JSON for prompts, logs, or file output.

• Dumas Strip Iteration Suffix

  • Input: filename
  • Output: cleaned STRING
  • Removes a trailing _<digits> iteration suffix before the file extension, for example asset_003.png -> asset.png.

• Dumas Slugify String

  • Input: text
  • Output: slug STRING
  • Converts text into a lowercase URL/file-safe slug, for example Crème brûlée 2026 -> creme-brulee-2026.

• Dumas JSON Get Value

  • Inputs: json_object, path
  • Output: JSON
  • Reads a nested value using dot paths like user.profile.name or items.0.id.

• Dumas JSON Set Value

  • Inputs: json_object, path, value_json
  • Output: updated JSON
  • Writes a parsed JSON value into a nested path without mutating the original object.

• Dumas JSON Has Key

  • Inputs: json_object, path
  • Output: BOOLEAN
  • Checks whether a nested path exists.

• Dumas JSON Remove Key

  • Inputs: json_object, path
  • Output: updated JSON
  • Removes a nested key or array item by path.

• Dumas JSON Pick Fields

  • Inputs: json_object, paths
  • Output: filtered JSON
  • Builds a new object from newline-separated paths that exist in the input.

• Dumas JSON Merge Objects

  • Inputs: base_object, overlay_object
  • Output: merged JSON
  • Deep-merges dictionaries so overlay values replace or extend the base object.

• Dumas JSON Keys

  • Input: json_object
  • Outputs: keys as JSON array, count as integer
  • Lists the top-level keys of an object and reports how many there are.

• Dumas JSON Array Length

  • Input: json_array
  • Output: INT
  • Returns the length of a JSON array.

• Dumas JSON Array Append

  • Inputs: json_array, value_json
  • Output: updated JSON
  • Appends a parsed JSON value to the end of an array.

• Dumas JSON Array Slice

  • Inputs: json_array, start, end, step
  • Output: sliced JSON
  • Returns an array slice. end=0 means "slice to the end".

• Dumas JSON Array Iterator

  • Inputs: json_input, index, mode
  • Outputs: item, current_index, total_items
  • Returns the current array item and position, with mode set to fixed, incr, or decr.

• Dumas JSON Object Iterator

  • Inputs: json_input, index, mode
  • Outputs: key, value, current_index, total_items
  • Returns the current object entry in insertion order, with mode set to fixed, incr, or decr.

• Dumas JSON Flatten

  • Input: json_input
  • Output: flat JSON
  • Flattens nested objects and arrays into dot-path keys.

• Dumas JSON Unflatten

  • Input: flat_json_object
  • Output: nested JSON
  • Rebuilds nested JSON from a flat dot-path object.

All nodes live in the Dumas/JSON category.

Installation

1. Change into your ComfyUI custom nodes directory:

   cd /path/to/ComfyUI/custom_nodes
   

2. Clone this repository:

   git clone https://git.dumas.ddns.net/chris.dumas/DumasNodes.git
   

3. Restart ComfyUI.

Usage

Use dot paths for nested access:

user.profile.name
items.0.id
settings.render.width

Dumas JSON Set Value expects value_json to be valid JSON, so strings should be quoted:

"Dumas"

{"enabled": true, "retries": 3}

Dumas JSON Pick Fields expects one path per line:

user.name
meta.active
items.0.id

Dumas JSON Array Slice treats end=0 as "use the rest of the array".

Dumas JSON Array Iterator clamps to valid bounds:

fixed -> use index as-is
incr  -> use index + 1
decr  -> use index - 1

Dumas JSON Object Iterator uses the same index rules and iterates object entries in their existing key order.

Dumas JSON Flatten and Dumas JSON Unflatten use the same dot-path format as the other path-based nodes.

Dumas Image Compare accepts one or two images. The new image socket forwards image2 when connected so you can keep the "after" image moving through the workflow, and falls back to image1 if only one input is present.

Save Image Dumas leaves folder empty to use ComfyUI's output directory. name feeds %input% and name_2 feeds %input2%, so a pattern like project/%input%_%input2%_%counter% can combine two upstream strings into the saved filename.

Dumas Strip Iteration Suffix only strips a final numeric suffix. Names like my_asset_final.png are left untouched, while my_asset_012.png becomes my_asset.png.

Dumas Slugify String lowercases text, strips accents, replaces non-alphanumeric runs with -, and trims leading or trailing dashes.

Roadmap

This repo is intended to grow into a broader set of Dumas-branded generic utility nodes, including JSON helpers and adjacent data-manipulation tools.

License

MIT.