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The Set Variable node assigns a value to a named variable. The value can be a static string or a computed expression.

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Behavior

  • Sets the named variable to the configured value
  • Supports both static values and dynamic expressions
  • The variable is available to all downstream nodes via {{variableName}}
  • Emits SET_VARIABLE.SUCCESS on completion or SET_VARIABLE.ERROR on failure

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Configuration

ParameterTypeDefaultOptionsDescription
variableNamestring""—Name of the variable to set
sourceenum"static"static, expressionHow the value is determined
valuestring""—Static value (used when source is static)
expressionstring""—Expression to evaluate (used when source is expression)

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Source types

SourceDescription
staticSet the variable to a literal string value
expressionEvaluate an expression (e.g., concatenation, arithmetic, or referencing other variables)

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Output handles

HandleDescription
SuccessVariable set successfully
ErrorFailed to set variable (e.g., invalid expression)

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Use cases

Set language to "en" at the start of the flow. Override it later based on caller input.
Use expression source to combine variables: set greeting to "Hello, " + {{customer_name}}.
Set a status variable at different points in the flow (e.g., "verified", "transferred") for use in API calls or logging.