Multi String Join

ComfyUI is full of text fragments - a subject block here, a style block there, a quality tag you always want at the end - and sooner or later you're manually pasting them together with commas and hoping it survives a queue. Multi String Join does the joining for you: up to however many string_N inputs you wire in, combined with a separator you control, plus a little text-filtering on the side. It's the "assemble the prompt from parts" node.

How it works

Every connected string_X input is cleaned, then joined with separator in wire order. The separator accepts escape sequences - \n, \t, \r are converted to real characters, so a newline join is one click instead of a paste adventure.

Two filters, both off by default:

• filter_comment - strips lines starting with # and anything inside """ / ''' blocks. Turn it on when your text blocks contain comments you want kept out of the final string.
• filter_empty_line - drops blank lines.

There's also input, a single value substituted into any {input} placeholder inside the joined text - a way to inject a variable (a filename, a seed, a dynamically-generated word) into a template without another join step. It's applied to each block before joining, so the same template can be reused with different injected values.

The inputs that matter

• separator (STRING, default \n) - the glue between blocks.
• input (STRING) - substituted for {input} in the blocks.
• filter_empty_line / filter_comment (BOOLEAN, both off by default) - the cleaners.
• string_1 … string_N - the text blocks, added as you drag wires.

One output: string (STRING), the joined result.

Installing it

ComfyUI Manager → search ComfyUI-1hewNodes → install → restart, or:

cd ComfyUI/custom_nodes
git clone https://github.com/1hew/ComfyUI-1hewNodes

Restart ComfyUI. Pure string processing - no models, no special deps beyond the pack's standard (heavy) requirements. The pack targets ComfyUI's newer comfy_api.latest API, so keep ComfyUI updated.

Common issues

The separator trap is thinking you typed a newline when you didn't: a literal \n in the field is converted, but if you paste an actual line break into the separator box, behavior can differ from what you expect - the escape-sequence handling is for the two-character form. Also, {input} substitution only fires if the placeholder actually appears in a block; an empty input with no placeholder changes nothing, which is the intended no-op. And remember the filters strip only when enabled - the default join does not clean your text, it just glues it, so if comments are leaking into prompts, flip filter_comment.