ComfyUI-EnvVariable

Minimal ComfyUI custom node that reads an environment variable by key and outputs it as a string.

Node

• Name: Environment Variable
• Input: key (STRING)
• Output: value (STRING)

Behavior:

• Returns os.environ[key] when present.
• Raises KeyError when the key is missing.

Install

Option 1. Clone into ComfyUI/custom_nodes/:

git clone https://github.com/wtesler/ComfyUI-EnvVariable.git

There are no additional requirements to install.

Option 2. Search and download "ComfyUI-EnvVariable" from Custom Nodes Manager.

Environment Variable Setup

Set the variable either in System Environment Variables or in your ComfyUI launch script (set MY_KEY=...). Then fully close and relaunch ComfyUI so the process receives updated environment values.