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$lowercase

$lowercase(string?) -> string
Compact type signature<s-:s>

If string is omitted, the current context value is used.

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Text

Source: JSONata

Documentation​

Returns a string with all the characters of str converted to lowercase. An error is thrown if str is not a string.

Examples​

Basic usage​

  • $lowercase("Hello World") => "hello world"

Normalize casing for display text​

Input

This example uses the eligibility example input. The expression reads plan.planName and converts it to lowercase.

Example input

JSON
{
  "memberId": "mbr-3001",
  "patientId": "pat-0001",
  "plan": {
    "planCode": "PLAN-100",
    "planName": "ExampleCare Standard"
  },
  "active": true,
  "effective": {
    "start": "2026-01-01",
    "end": "2026-12-31"
  },
  "copay": {
    "visit": 25,
    "urgentCare": 50
  },
  "deductibleRemaining": 300
}

Expression

$lowercase(plan.planName)

Result

"examplecare standard"