Danbot Concat String

Every prompt pack ships a string joiner, and Danbot Concat String is this one's. You plug in up to six strings, it glues them together with a separator you set, and hands you one combined string. That's it - but in a tag-translation workflow it earns its place, because you're constantly stitching: translation output + extension output + a quality-tag suffix like masterpiece, best quality + maybe a hand-written override.

The interesting defaults are where the quality lives. The separator defaults to ", " - comma-space - which is exactly the delimiter the Danbooru tag vocabulary expects (and that prompt-engineering lore insists on: no underscores, commas with spaces). If you're building tag lists, don't change it. Where you would change it is if you're gluing whole sentences or template fragments together - set it to "\n" or nothing and it behaves like a plain concat.

The details that matter

• Six inputs, string_1 through string_6, all optional. Empty and whitespace-only inputs are silently dropped, so a dangling unconnected socket won't produce ", , ," in your prompt. That's a nicer behavior than most joiners have.
• Each string is trimmed before joining, which kills the stray spaces that ComfyUI nodes love to leave behind.
• Only the separator input is typed by hand; the six string sockets are forceInput, so they're for wiring, not typing. If you want to type text into the graph, that's what Danbot Text Input is for - text node → this joiner → text encoder is the canonical chain.

The gotcha

Everything that goes in comes out joined - there's no deduplication and no sorting. If your translation pass and extension pass both emit 1girl, you'll get 1girl, 1girl in your final prompt. That's usually harmless (models mostly shrug at duplicate tags) but if it bugs you, dedupe before you hit this node. Also note the output is a plain STRING, so you can chain joiners if six inputs somehow aren't enough.

Install

Same one-line install as every node in this pack. ComfyUI Manager → danbot-comfy-node, or:

cd ComfyUI/custom_nodes
git clone https://github.com/p1atdev/danbot-comfy-node
cd danbot-comfy-node
pip install -r requirements.txt

(portable: ../../../python_embeded/python.exe -s -m pip install -r requirements.txt.) It sits under prompt/Danbooru Tags Translator/utils after restart.