Text Concatenate (NH)

There are a hundred ways to glue strings together in ComfyUI, and most of them leave stray spaces, double delimiters, or a pile of nodes on your canvas. Text Concatenate (NH) is the grown-up version: join up to 64 strings with a single delimiter, with whitespace cleanup built in, all in one node.

The headline input is string_count, default 2, max 64 - it controls how many string slots the node shows. That's the feature that makes this different from a fixed-input join node: you set it to 3 or 12 or 40 and the node exposes exactly that many string_N inputs, no more, no clutter. Every slot is optional, and you can connect a text node into any of them.

Then two things happen per input: it's stripped of surrounding whitespace (that's the clean_whitespace toggle, on by default), and everything gets joined with the delimiter between each piece. The default delimiter is /, which is a bit of a tell - this node was clearly built for building paths (filenames, folder paths, model paths) as much as prompts. Set the delimiter to , for prompt work or leave it as / for path assembly.

The sharp edges

Because slots are optional and whitespace is stripped, an unconnected or empty slot simply vanishes - no empty strings in the middle of your output, no a//b artifacts. That's usually what you want, but note the two ways it can still surprise you:

• string_count controls visibility, not validity. If you raise it from 2 to 4, you get string_3 and string_4 sockets; lower it back and those inputs are hidden but their values aren't lost in a saved workflow you later re-expand. It's a display control, not a data delete.
• It's a join, not a formatter. Every piece gets the same delimiter, so you can't do "comma between subjects, but a space before the style tag." For per-slot custom separators you're back to Prompt Join or a hand-built approach.

The single output is text, a plain STRING, ready for a CLIP encoder, a filename node, or another text node. There's no count output here - if you need to know how many strings actually made it in, count them upstream.

Install

It's in the NH-Nodes pack:

• ComfyUI Manager → search NH-Nodes → install → restart ComfyUI. Or manually:

cd ComfyUI/custom_nodes
git clone https://github.com/jetthuangai/NH-Nodes.git
cd NH-Nodes
pip install -r requirements.txt

Then restart ComfyUI.

No models, no extra dependencies.

Common issues

The classic confusion is expecting a fixed number of inputs: you add a string to the graph and can't find the socket, because string_count was left at its default 2. Bump it and the slot appears. The other one is delimiter amnesia - a path that comes out as folderprompts/name because you forgot the leading slash on the delimiter. And if your output looks clean but the downstream node complains about empty strings, check clean_whitespace - turning it off will happily preserve those spaces you've been ignoring.