@mapbox/geo-viewport/example/us.json

convert between viewports and extents

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "properties": {},
      "geometry": {
        "type": "Polygon",
        "coordinates": [
          [
            [
              -126.91406249999999,
              50.064191736659104
            ],
            [
              -91.40625,
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            ],
            [
              -82.44140625,
              45.706179285330855
            ],
            [
              -78.75,
              44.08758502824518
            ],
            [
              -66.796875,
              48.22467264956519
            ],
            [
              -65.56640625,
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            ],
            [
              -78.22265625,
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            ],
            [
              -78.92578124999999,
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            ],
            [
              -82.08984375,
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            ],
            [
              -84.72656249999999,
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            ],
            [
              -93.515625,
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            ],
            [
              -95.97656249999999,
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            ],
            [
              -106.34765625,
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            ],
            [
              -113.203125,
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            ],
            [
              -120.234375,
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            ],
            [
              -125.68359374999999,
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            ],
            [
              -126.21093749999999,
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            ],
            [
              -126.91406249999999,
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            ]
          ]
        ]
      }
    }
  ]
}