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$floor

$floor(number?) -> number
Compact type signature<n-:n>

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

Browse categories
Numeric And Math

Source: JSONata

Documentation​

Returns the value of number rounded down to the nearest integer that is smaller or equal to number.

Examples​

Basic usage​

  • $floor(5) => 5
  • $floor(5.3) => 5
  • $floor(5.8) => 5
  • $floor(-5.3) => -6

Round a lab value down​

Input

This example uses the labs example input. The expression reads the first lab result's value and rounds it down.

Example input

JSON
[
  {
    "code": "LAB-1001",
    "display": "hemoglobin A1c",
    "value": 5.4,
    "unit": "%",
    "collectedAt": "2026-02-10T08:15:00Z",
    "interpretation": "normal",
    "note": "fasting sample"
  },
  {
    "code": "LAB-1002",
    "display": "total cholesterol",
    "value": 212,
    "unit": "mg/dL",
    "collectedAt": "2026-02-10T08:15:00Z",
    "interpretation": "high",
    "note": "repeat in 3 months"
  },
  {
    "code": "LAB-1003",
    "display": "creatinine",
    "value": 0.9,
    "unit": "mg/dL",
    "collectedAt": "2026-03-09T12:05:00Z",
    "interpretation": "normal",
    "note": ""
  },
  {
    "code": "LAB-1004",
    "display": "vitamin D",
    "value": 18,
    "unit": "ng/mL",
    "collectedAt": "2026-03-09T12:05:00Z",
    "interpretation": "low",
    "note": "supplement recommended"
  },
  {
    "code": "LAB-1005",
    "display": "thyroid stimulating hormone",
    "value": null,
    "unit": "mIU/L",
    "collectedAt": "2026-03-09T12:05:00Z",
    "interpretation": "pending",
    "note": "result not available yet"
  }
]

Expression

$floor($[0].value)

Result

5