Concatenation Node
Overview
The Concatenation Node creates strings by combining text templates with variables from your flow. This node is particularly useful for formatting output messages, creating dynamic content, or combining multiple data sources into a single text output. It supports flexible variable insertion with customizable array formatting and robust error handling for missing variables.
Usage cost: 0 credit
Configuration
Settings
Template Configuration
Template* (text area): The text template where you can insert variables
Use the variable insertion interface to add variables from previous nodes
Supports multi-line templates for complex formatting
Variables are inserted visually and automatically formatted
Example:
"Title: {inserted_title_variable}, Body: {inserted_content_variable}"
Array Formatting
Array Separator (text): Custom separator for array variables
Used when an inserted variable resolves to an array/list
Common examples:
", "(comma space)," | "(pipe),"\n"(new line)Leave empty to use default array formatting
Error Handling
Handle Missing Variables* (dropdown): Strategy for missing or null variables
Error: Stop execution and throw an error if variable not found
Empty: Replace missing variables with empty string
Skip: Keep original variable reference in output for missing variables
Output Ports
result(string): The concatenated string resultAll inserted variables are replaced with their actual values
Arrays are formatted using the specified separator
Missing variables are handled according to the selected strategy
Common Issues
Variable availability - Ensure selected variables come from nodes that execute before this concatenation node
Unexpected array formatting - Verify array separator settings when working with list variables
Template structure - Check that your template creates the intended output format
Missing variable handling - Review error handling strategy if execution stops unexpectedly
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