Is empty
Input
| value |
|---|
Validate that value is empty
validation:isEmpty
Ensure field is empty for its value type (whitespace, [], {}, null, undefined)
source:value
Output
| result |
|---|
| Pass |
| Pass |
| Pass |
| Field "value" is not empty |
| Field "value" is not empty |
| Field "value" is not empty |
Sample inputs run locally in your browser using the same operation logic as Fontana Flow.
Results are illustrative, not connected to a workflow.
Ensure field is empty for its value type (whitespace, [], {}, null, undefined).
Parameters
This operation has no configurable parameters.
Field selection
- source — Field whose values this operation reads. Use a single field name, a comma-separated list of plain field paths (
cash_flow_type, currency) from the multi-select UI, or a regex via Pattern mode. Omit to apply to all fields on the row. - target — Optional output field. When omitted, the source field is updated in place. Hidden when more than one named source field is selected.
JSON Configuration
{ "id": "op-isEmpty", "type": "validation", "action": "isEmpty", "params": {}, "testInputs": [ "", " ", "[]", "hello", "0", "[\"x\"]" ]}