Paring json Array object

Maybe make coordinates a Vector2 array.
then use

 coordinates[0] = new Vector2(geometry.coordinates[0][0].n, geometry.coordinates[0][1].n); 

or something like that.

Unity's JsonUtility does not support jagged arrays. Only arrays inside classes that are inside arrays are supported. So you can not parse this json text with Unity's JsonUtility. You need to use a different parser. Either use Newtonsoft's Json.NET parser or my SimpleJSON parser which does not require that you create any classes. You can directly read the data. With the Unity extension file you get direct support for Vector2.

So when you do

 var root = JSON.Parse(geoJson);

you can simply do

 Vector2 coords = root["geometry"]["coordinates"];

I build a workaround, so I can fill my Class directly with a Vector2 Array (maybe not the best, but it works):

 using Newtonsoft.Json;
 [...]
 dynamic deserialized = JsonConvert.DeserializeObject(geoJson);
 RouteFeature routeFeature = new RouteFeature();
 routeFeature.type = deserialized.type;
 routeFeature.features = new List<Feature>();
 foreach (var item in deserialized.features)
 {
     routeFeature.features.Add(new Feature()
     {
     type = item.properties.type,
         name = item.properties.name,
         geometry = new Geometry()
         {
             type = item.geometry.type,
             coordinates = StringToVector2Array(item.geometry.coordinates.ToString())
         },
         properties = new Properties()
         {
             highway = item.properties.highway,
             profile = item.properties.profile,
             distance = item.properties.distance,
             time = item.properties.time,
             name = item.properties.name
         }
     });
 }
     [...]

 Vector2[] StringToVector2Array(string coordinateString)
     {
         coordinateString = coordinateString.Replace(" ", "");
         coordinateString = coordinateString.Replace("[", "");
         coordinateString = coordinateString.Replace("]", "");
         coordinateString = coordinateString.Replace("\n", "");
         //.Trim(new Char[] { ' ', '[', ']', '\n' });
         string[] strArray = coordinateString.Split(',');
 
         Vector2[] vecArray = new Vector2[strArray.Length/2];
         for(int i = 0; i<strArray.Length/2; i ++)
         {
             vecArray[i] = new Vector2(float.Parse(strArray[i * 2]), float.Parse(strArray[i * 2 + 1]));
         }
         return vecArray;
     }

And here is the tarket Class (Classes actually):

 using System.Collections.Generic;
 using UnityEngine;
 
 public class Geometry
 {
     public string type { get; set; }
     public Vector2[] coordinates { get; set; }
 }
 
 public class Properties
 {
     public string highway { get; set; }
     public string profile { get; set; }
     public string distance { get; set; }
     public string time { get; set; }
     public string name { get; set; }
 }
 
 public class Feature
 {
     public string type { get; set; }
     public string name { get; set; }
     public Geometry geometry { get; set; }
     public Properties properties { get; set; }
 }
 
 public class RouteFeature
 {
     public string type { get; set; }
     public List<Feature> features { get; set; }
 }