Stylo Docs

system/function — Run custom JavaScript code within your workflow.

Where it appears

The Function block lives in the Logic & control group of the Workflow Builder.

Field	Type	Required	Default	Description
`inputData`	text (multi-line, supports references)	No	—	Data to expose to your code as `input.inputData`. If you reference a single upstream object/array, it's passed through as-is; otherwise the JSON is parsed.
`code`	code	Yes	—	JavaScript executed at this step. Read the Input Data field via `input.inputData` and `return` a value, which becomes the block's `result` output for downstream steps.
`timeout`	text	No	`5000`	Maximum execution time. Values above 10000ms are clamped.

Inputs are the configurable fields above. The block produces these outputs:

Outputs

Reference an output downstream with <Function.field>.

Name	Type	Description
`result`	json	Return value from the executed JavaScript function
`stdout`	string	Console log output from function execution
`success`	boolean	Whether function executed successfully
`error`	string	Error message if execution failed

A minimal configuration for this block:

{
  "type": "system/function",
  "config": {
    "code": "...",
    "timeout": "5000"
  }
}

Required field (code) must be set, or the block fails validation before it runs.
On failure the error output is populated; downstream blocks that reference other outputs may not receive values.