EPSG:23031 - ED50 / UTM zone 31N

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "ProjectedCRS",
  "name": "ED50 / UTM zone 31N",
  "base_crs": {
    "name": "ED50",
    "datum": {
      "type": "GeodeticReferenceFrame",
      "name": "European Datum 1950",
      "ellipsoid": {
        "name": "International 1924",
        "semi_major_axis": 6378388,
        "inverse_flattening": 297
      }
    },
    "coordinate_system": {
      "subtype": "ellipsoidal",
      "axis": [
        {
          "name": "Geodetic latitude",
          "abbreviation": "Lat",
          "direction": "north",
          "unit": "degree"
        },
        {
          "name": "Geodetic longitude",
          "abbreviation": "Lon",
          "direction": "east",
          "unit": "degree"
        }
      ]
    },
    "id": {
      "authority": "EPSG",
      "code": 4230
    }
  },
  "conversion": {
    "name": "UTM zone 31N",
    "method": {
      "name": "Transverse Mercator",
      "id": {
        "authority": "EPSG",
        "code": 9807
      }
    },
    "parameters": [
      {
        "name": "Latitude of natural origin",
        "value": 0,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8801
        }
      },
      {
        "name": "Longitude of natural origin",
        "value": 3,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8802
        }
      },
      {
        "name": "Scale factor at natural origin",
        "value": 0.9996,
        "unit": "unity",
        "id": {
          "authority": "EPSG",
          "code": 8805
        }
      },
      {
        "name": "False easting",
        "value": 500000,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8806
        }
      },
      {
        "name": "False northing",
        "value": 0,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8807
        }
      }
    ]
  },
  "coordinate_system": {
    "subtype": "Cartesian",
    "axis": [
      {
        "name": "Easting",
        "abbreviation": "E",
        "direction": "east",
        "unit": "metre"
      },
      {
        "name": "Northing",
        "abbreviation": "N",
        "direction": "north",
        "unit": "metre"
      }
    ]
  },
  "scope": "Engineering survey, topographic mapping.",
  "area": "Europe - between 0°E and 6°E - Andorra; Denmark (North Sea); France - offshore; Germany - offshore; Netherlands - offshore; Norway including Svalbard - onshore and offshore; Spain - onshore (mainland and Balearic Islands); United Kingdom - offshore UKCS.",
  "bbox": {
    "south_latitude": 38.56,
    "west_longitude": 0,
    "north_latitude": 82.45,
    "east_longitude": 6
  },
  "id": {
    "authority": "EPSG",
    "code": 23031
  }
}

{'crs_wkt': 'PROJCRS["ED50 / UTM zone 31N",BASEGEOGCRS["ED50",DATUM["European '
            'Datum 1950",ELLIPSOID["International '
            '1924",6378388,297,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4230]],CONVERSION["UTM '
            'zone 31N",METHOD["Transverse '
            'Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural '
            'origin",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude '
            'of natural '
            'origin",3,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale '
            'factor at natural '
            'origin",0.9996,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False '
            'easting",500000,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False '
            'northing",0,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["(E)",east,ORDER[1],LENGTHUNIT["metre",1]],AXIS["(N)",north,ORDER[2],LENGTHUNIT["metre",1]],USAGE[SCOPE["Engineering '
            'survey, topographic mapping."],AREA["Europe - between 0°E and 6°E '
            '- Andorra; Denmark (North Sea); France - offshore; Germany - '
            'offshore; Netherlands - offshore; Norway including Svalbard - '
            'onshore and offshore; Spain - onshore (mainland and Balearic '
            'Islands); United Kingdom - offshore '
            'UKCS."],BBOX[38.56,0,82.45,6]],ID["EPSG",23031]]',
 'false_easting': 500000.0,
 'false_northing': 0.0,
 'geographic_crs_name': 'ED50',
 'grid_mapping_name': 'transverse_mercator',
 'horizontal_datum_name': 'European Datum 1950',
 'inverse_flattening': 297.0,
 'latitude_of_projection_origin': 0.0,
 'longitude_of_central_meridian': 3.0,
 'longitude_of_prime_meridian': 0.0,
 'prime_meridian_name': 'Greenwich',
 'projected_crs_name': 'ED50 / UTM zone 31N',
 'reference_ellipsoid_name': 'International 1924',
 'scale_factor_at_central_meridian': 0.9996,
 'semi_major_axis': 6378388.0,
 'semi_minor_axis': 6356911.9461279465}