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Is lowercase

Input
value
Validate that value is lowercase
validation:
isLowercase

Ensure string field is lowercase

source:value
Output
result
Pass
Pass
Pass
Field "value" must be lowercase
Field "value" must be lowercase
Field "value" must be lowercase

Sample inputs run locally in your browser using the same operation logic as Fontana Flow.
Results are illustrative, not connected to a workflow.

Ensure string field is lowercase.

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-isLowercase",
  "type": "validation",
  "action": "isLowercase",
  "params": {},
  "testInputs": [
    "hello world",
    "lowercase",
    "all good",
    "HELLO WORLD",
    "MixedCase",
    "UPPER"
  ]
}
Section titled “Related”
  • lowercase – Transform to lowercase before validation