I'm not a programmer, but can usually follow other examples to accomplish what I want. I'm having trouble understanding how to use data being returned from Google Distance Matrix API. 

I have 3 inputs:

From_Address

To_Address

Distance

Once someone puts information in the To_Address, I want to return the miles in the Distance input. 

I've set up getURL to Google Distance Matrix API and have a successful response back. I see that the data is stored in map.get("responseText"). Here is the complete response: 

{
   "destination_addresses" : [ "Plainfield, IN 46168, USA" ],
   "origin_addresses" : [ "Indianapolis, IN 46222, USA" ],
   "rows" : [
      {
         "elements" : [
            {
               "distance" : {
                  "text" : "18.5 mi",
                  "value" : 29806
               },
               "duration" : {
                  "text" : "27 mins",
                  "value" : 1628
               },
               "status" : "OK"
            }
         ]
      }
   ],
   "status" : "OK"
}

I have no idea how to take the information stored in map.get("responseText") and get down to just 18.5 mi being returned to my Distance input. 

Can a kind soul, please walk me through the process? 

Thanks!