vrl 0.32.0

Vector Remap Language
Documentation 
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{
  "anchor": "is_json",
  "name": "is_json",
  "category": "Type",
  "description": "Check if the string is a valid JSON document.",
  "arguments": [
    {
      "name": "value",
      "description": "The value to check if it is a valid JSON document.",
      "required": true,
      "type": [
        "string"
      ]
    },
    {
      "name": "variant",
      "description": "The variant of the JSON type to explicitly check for.",
      "required": false,
      "type": [
        "string"
      ],
      "enum": {
        "object": "JSON object - {}",
        "array": "JSON array - []",
        "string": "JSON-formatted string values wrapped with quote marks",
        "number": "Integer or float numbers",
        "bool": "True or false",
        "null": "Exact null value"
      }
    }
  ],
  "return": {
    "types": [
      "boolean"
    ],
    "rules": [
      "Returns `true` if `value` is a valid JSON document.",
      "Returns `false` if `value` is not JSON-formatted."
    ]
  },
  "examples": [
    {
      "title": "Valid JSON object",
      "source": "is_json(\"{}\")",
      "return": true
    },
    {
      "title": "Non-valid value",
      "source": "is_json(\"{\")",
      "return": false
    },
    {
      "title": "Exact variant",
      "source": "is_json(\"{}\", variant: \"object\")",
      "return": true
    },
    {
      "title": "Non-valid exact variant",
      "source": "is_json(\"{}\", variant: \"array\")",
      "return": false
    },
    {
      "title": "Valid JSON string",
      "source": "is_json(s'\"test\"')",
      "return": true
    }
  ],
  "pure": true
}