vrl 0.32.0

Vector Remap Language
Documentation 
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{
  "anchor": "exists",
  "name": "exists",
  "category": "Path",
  "description": "Checks whether the `path` exists for the target.\n\nThis function distinguishes between a missing path\nand a path with a `null` value. A regular path lookup,\nsuch as `.foo`, cannot distinguish between the two cases\nsince it always returns `null` if the path doesn't exist.",
  "arguments": [
    {
      "name": "field",
      "description": "The path of the field to check.",
      "required": true,
      "type": [
        "any"
      ]
    }
  ],
  "return": {
    "types": [
      "boolean"
    ]
  },
  "examples": [
    {
      "title": "Exists (field)",
      "source": ". = { \"field\": 1 }\nexists(.field)\n",
      "return": true
    },
    {
      "title": "Exists (array element)",
      "source": ". = { \"array\": [1, 2, 3] }\nexists(.array[2])\n",
      "return": true
    },
    {
      "title": "Does not exist (field)",
      "source": "exists({ \"foo\": \"bar\"}.baz)",
      "return": false
    }
  ],
  "pure": true
}