String List Combine

String List Combine does exactly what it says: takes up to four lists of strings and concatenates them into one. One required input (list_1), three optional (list_2 through list_4), one output: a single list. It's the kind of boring utility node that you don't appreciate until you're building a prompt-batching workflow and realize you need to union prompts from several sources - say, one list you typed, one generated by String List from Text, and one from an external node - before sending the whole thing to a sampler.

How it works

The implementation is a straightforward concatenation. Each list input is received as a list (the node declares INPUT_IS_LIST), and combine starts with a copy of list_1 and extends it with list_2, list_3, and list_4 in order, skipping any that are missing. Order is preserved: the first list's items come first, then the second's, and so on. No deduplication, no sorting, no flattening beyond one level - if that matters to you, it's worth knowing going in.

Inputs and outputs

• list_1 (required) - a STRING list
• list_2, list_3, list_4 (optional) - more STRING lists, in the order you want them appended

Output: strings - the combined list. It feeds anything that consumes a string list, including other nodes in this pack or a loop that iterates over prompts.

Where it fits

This node makes the most sense when paired with the pack's other string utilities. StringListFromText turns multiline text into a list; you might have a couple of those producing prompt variants, and you want to run them as one batch. Combine is the glue. It's also handy for mixing a base set of prompts with a dynamically generated set - combine once, iterate once.

Install

Pack install via ComfyUI Manager (search "Latent Astronaut Suite") or:

cd ComfyUI/custom_nodes
git clone https://github.com/latentastronaut/comfyui-latent-astronaut-suite

Restart. No dependencies beyond stock ComfyUI. The main thing to remember: inputs are lists, not single strings - if you wire a plain STRING output in, ComfyUI will treat it as a list of one, which is probably not what you want. And because order is preserved without dedup, feed lists in the order you actually want them to appear downstream.