For Loop End

This is the bottom bracket of a loop. On its own it does nothing interesting - its whole job is to sit at the end of a repeating section and tell ComfyUI "go back and do that again until we're done." It's always used as a pair: a loop-start node (easy forLoopStart, or easy loadImagesForLoop) opens the loop, your processing sits in the middle, and easy forLoopEnd closes it. ComfyUI itself has no built-in looping, so this pair is how you get one.

Why you'd reach for it

Looping unlocks the batch jobs a single-pass graph can't express cleanly:

• Run the same processing over every image in a folder (with easy loadImagesForLoop as the start).
• Generate N variations by iterating a counter and feeding it to a seed or an index switch.
• Iteratively refine - feed each pass's output back as the next pass's input, N times.

The key idea is the carried values. A loop usually needs to remember something between iterations: an accumulating list of results, a running total, the image from the previous pass. easy forLoopEnd is where those values loop back around. You wire what you want to carry into its initial_value sockets, and it feeds them back to the loop-start for the next round.

The inputs and outputs

• flow (FLOW_CONTROL, required) - the loop-control signal from the matching loop-start node. This connection is the loop; without it, there's nothing to close.
• initial_value1 … initial_value19 (any, optional) - the values you want carried across iterations. Wire your per-pass results (an updated list, a counter, the latest image) into these.
• value1 … value19 (any) - the corresponding outputs, available once the loop completes, holding the final carried values.

You don't need all 19 - connect as many value channels as your loop actually accumulates. Most loops use one or two.

Installing it

ComfyUI Manager: search ComfyUI Easy Use, install, restart. Or:

cd ComfyUI/custom_nodes
git clone https://github.com/yolain/ComfyUI-Easy-Use

then install the requirements (install.bat on Windows, else pip install -r ComfyUI-Easy-Use/requirements.txt) and restart.

Common issues

• The flow wire is non-negotiable. easy forLoopEnd must be connected to a loop-start via flow. A dangling end node, or one wired to the wrong start, is the most common reason a "loop" runs once or errors.
• Match the value channels end to end. A value you carry has to line up between the start and end nodes - value1 at the end pairs with the corresponding channel at the start. Cross them and the wrong data circulates.
• Loops multiply cost. Everything inside the loop body runs once per iteration, so a slow inner workflow times N iterations is exactly that slow. Test with a small iteration count first.
• Accumulate deliberately. If you want to keep every iteration's result, you have to build that up through the carried values (e.g. append to a list each pass) - the loop doesn't magically collect outputs for you. Save inside the loop body if you just want files on disk.