Something wrong with GeoJSON for LineString

Question

I'm using Python's GeoJSON package to created a simple LineString, put it in a Feature, and put that in a FeatureCollection I'll call featColl. featColl.errors() returns no errors. Below is the dumped GeoJSON file. When I import it as a vector layer into QGIS, it opens without complaint. but the layer is completely empty, and shows no line segments. Any ideas what I'm missing?

{
 "type": "FeatureCollection",
 "features": [
  {
   "type": "Feature",
   "geometry": {
    "type": "LineString",
    "coordinates": [
     [
      [
       -122.271154,
       37.804348
      ],
      [
       -122.272057,
       37.80295
      ]
     ],
     [
      [
       -122.272057,
       37.80295
      ],
      [
       -122.278011,
       37.805288
      ]
     ],
    ]
   },
   "properties": {}
  }
 ]
}

Answer 1

You have 3 levels of nesting in your coordinates which is not right for a simple linestring.

Either make it a MultiLineString

{
  "type": "FeatureCollection", 
  "features": [ 
    {
      "type": "Feature", 
      "geometry": { 
        "type": "MultiLineString", 
        "coordinates": [ 
          [ 
            [ -122.271154, 37.804348 ], 
            [ -122.272057, 37.80295 ] 
          ], 
          [ 
            [ -122.272057, 37.80295 ], 
            [ -122.278011, 37.805288 ] 
          ]  
        ] 
      }, 
      "properties": {} 
    } 
  ] 
} 

Or remove the extra level of nesting

{
  "type": "FeatureCollection",
  "features": [
      {
        "type": "Feature",
        "geometry": {
          "type": "LineString",
          "coordinates": [
            [-122.271154, 37.804348],
            [-122.272057, 37.80295],
            [-122.272057, 37.80295],
            [-122.278011, 37.805288]
          ]
        },
        "properties": {}
      }
  ]
}