QGIS/resources/function_help/json/point_on_surface

{
  "name": "point_on_surface",
  "type": "function",
  "groups": ["GeometryGroup"],
  "description": "Returns a point guaranteed to lie on the surface of a geometry.",
  "arguments": [{
    "arg": "geometry",
    "description": "a geometry"
  }],
  "examples": [{
    "expression": "point_on_surface(@geometry)",
    "returns": "a point geometry"
  }],
  "tags": ["point", "surface", "lie", "centroid", "overlay", "within"]
}