QGIS/resources/function_help/json/to_json

{
  "name": "to_json",
  "type": "function",
  "groups": ["Maps"],
  "description": "Create a JSON formatted string from a map, array or other value.",
  "arguments": [{
    "arg": "value",
    "description": "The input value"
  }],
  "examples": [{
    "expression": "to_json(map('1','one','2','two'))",
    "returns": "{\"1\":\"one\",\"2\":\"two\"}"
  }, {
    "expression": "to_json(array(1,2,3))",
    "returns": "[1,2,3]"
  }],
  "tags": ["formatted", "json", "array", "create", "other", "map"]
}