com.facebook.react.bridge.UnexpectedNativeTypeException: Value for iceServers cannot be cast from ReadableNativeMap to ReadableArray

You have given invalid json for iceServers. 

iceServers: [{
   urls: [ "stun:ws-***********" ]
}, {
   username: "*****",
   credential: "****",
   urls: [
       "turn:*****:80?transport=udp",
       "turn:****:3478?transport=udp",
   ]
}]

valid pattern

"iceServers": 
        [
          {
          "urls": "turn:*****:80?transport=udp",
          "username": '*****',
          "credential": '****'
          },
          {
          "urls": "stun:****",
          "username": '****',
          "credential": '****'
          }
]