QGIS/resources/function_help/json/bounds_width

{
  "function": "bounds_width",
  "description": "Returns the width of the bounding box of a geometry. Calculations are in the Spatial Reference System of this geometry.",
  "arguments": [ {"arg":"geom","description":"a geometry"}],
  "examples": [ { "expression":"bounds_width($geometry)", "returns":"width of bounding box of $geometry"}]
}