Required

Input

value

Validate that value is required

validation:

required

Ensure field exists and is not empty

source:value

Output

result
Pass
Pass
Pass
Required field "value" is empty
Pass
Pass

* 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 exists and is not empty.

Parameters

This operation has no configurable parameters.

Field selection

• source — Field whose values this operation reads. Omit to apply to all fields on the row.
• target — Optional output field. When omitted, the source field is updated in place.

JSON Configuration

{
  "id": "op-required",
  "type": "validation",
  "action": "required",
  "params": {},
  "testInputs": [
    "hello world",
    "value",
    "present",
    "",
    "   ",
    "\t"
  ]
}