test.geojson

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {"id": 1},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
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            ],
            [
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            ],
            [
              3.64471435546875,
              43.644025847699496
            ],
            [
              3.58978271484375,
              43.69766549666678
            ],
            [
              3.51837158203125,
              43.53660274231031
            ],
            [
              3.76556396484375,
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            ],
            [
              3.9193725585937496,
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            ],
            [
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            ],
            [
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            ],
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            ],
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            ],
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            ],
            [
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            ]
          ]
        ]
      }
    }
  ]
}