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ComfyUI Primitive Convert

Custom nodes for ComfyUI that convert between primitive data types (string, integer, float, boolean).

Installation

  1. Clone this repo into your ComfyUI/custom_nodes/ folder:

    cd ComfyUI/custom_nodes
git clone https://github.com/microcoder/comfyui-primitive-convert.git

  2. Restart ComfyUI

Nodes

All nodes are located in the utils/convert category.

To String

Converts any input value to its string representation. Supports: numbers, booleans, None, tensors, lists, dictionaries — anything that has a str() representation.

To Int

Converts input to an integer:

  • FLOAT → rounded to nearest integer
  • STRING → parsed as number (e.g., "42" → 42)
  • BOOLEAN → True = 1, False = 0
  • Invalid or empty input → 0

To Float

Converts input to a floating-point number:

  • INT → converted to float (e.g., 42 → 42.0)
  • STRING → parsed as float (e.g., "3.14" → 3.14)
  • BOOLEAN → True = 1.0, False = 0.0
  • Invalid or empty input → 0.0

Use Cases

You can use this for input node parameter filename_prefix of the Save Image node to name the output generations meaningfully. For example (Download the workflow):

In the output folder you will get file names similar to the following:

License

MIT