ComfyUI Combine string template

A ComfyUI custom node that performs positional placeholder substitution on a template string.

Author a template with $0, $1, $2, … placeholders and the node replaces each with the matching connected string input.

Install

Clone into your ComfyUI custom_nodes directory:

cd ComfyUI/custom_nodes
git clone https://github.com/SergeBekenkamp/ComfyUI-Combine-Strings-Template.git comfyui_replace_string_literals

Restart ComfyUI. No extra dependencies.

Node: Combine string template

• Category: utils/string
• Search aliases: template, format, interpolate, substitute, placeholder, string format, $0

Inputs

| Input | Type | Notes | |---|---|---| | template | string (multiline) | The template text. Default $0. | | strings | autogrow string sockets | |

Output

| Output | Type | |---|---| | (string) | The template with placeholders substituted. |

Placeholder syntax

Reference connected string inputs by index:

• $N — bare form, e.g. $0, $1, $10
• ${N} — braced form, e.g. ${0}, ${1} (use when a digit follows, e.g. ${1}000)

Index N maps to socket stringN. Indices are greedy: $10 means index 10, not $1 followed by 0.

Example

<img width="1501" height="625" alt="image" src="https://github.com/user-attachments/assets/b005c341-b711-4cae-a7d3-7e765b957779" />