QGIS/resources/function_help/json/map_to_json

{
  "name": "map_to_json",
  "type": "function",
  "groups": ["Maps"],
  "description": "Merge map elements into a json-formatted string.",
  "arguments": [
    {"arg":"map", "description":"the input map"}],
  "examples": [ { "expression":"map_to_json(map('qgis','rocks'))", "returns":"{\"qgis\":\"rocks\"}"}
  ]
}