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$not

$not(value?) -> boolean
Compact type signature<x-:b>

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

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Logical Checks

Source: JSONata

Documentation​

Returns Boolean NOT on the argument. arg is first cast to a boolean

Examples​

Negate a boolean flag​

Input

This example uses the eligibility example input. The expression reads the top-level active flag and negates it.

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

$not(active)

Result

false