GeoJSON polygon feature

polygon-feature.geojson

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -0.12960433959960938,
              51.50713981232172
            ],
            [
              -0.12960433959960938,
              51.50852877586289
            ],
            [
              -0.1262569427490234,
              51.50852877586289
            ],
            [
              -0.1262569427490234,
              51.50713981232172
            ],
            [
              -0.12960433959960938,
              51.50713981232172
            ]
          ]
        ]
      }
    }
  ]
}