extract a value from a googlemaps JSON response - regex

Question

My JSON_Respon from googlemap API give
%{ body: body} = HTTPoison.get! url
body = {
"geocoded_waypoints" : [{ ... },{ ... }],
"routes" : [{
"bounds" : { ...},
"copyrights" : "Map data ©2018 Google",
"legs" : [
{
"distance" : {
"text" : "189 km",
"value" : 188507
},
"duration" : {
"text" : "2 hours 14 mins",
"value" : 8044
},
"end_address" : "Juhan Liivi 2, 50409 Tartu, Estonia",
"end_location" : {
"lat" : 58.3785389,
"lng" : 26.7146963
},
"start_address" : "J. Sütiste tee 44, 13420 Tallinn, Estonia",
"start_location" : {
"lat" : 59.39577569999999,
"lng" : 24.6861104
},
"steps" : [
{ ... },
{ ... },
{ ... },
{ ... },
{
"distance" : {
"text" : "0.9 km",
"value" : 867
},
"duration" : {
"text" : "2 mins",
"value" : 104
},
"end_location" : {
"lat" : 59.4019886,
"lng" : 24.7108114
},
"html_instructions" : "XXXX",
"maneuver" : "turn-left",
"polyline" : {
"points" : "XXXX"
},
"start_location" : {
"lat" : 59.3943677,
"lng" : 24.708647
},
"travel_mode" : "DRIVING"
},
{ ... },
{ ... },
{ ... },
{ ... },
{ ... },
{ ... },
{ ... },
{ ... },
{ ... }
],
"traffic_speed_entry" : [],
"via_waypoint" : []
}
],
"overview_polyline" : { ... },
"summary" : "Tallinn–Tartu–Võru–Luhamaa/Route 2",
"warnings" : [],
"waypoint_order" : []
}
],
"status" : "OK"
}
(check the attached image)
in red what I'm getting with with bellow command from Regex.named_captures module
%{"duration_text" => duration_text, "duration_value" => duration_value} = Regex.named_captures ~r/duration\D+(?<duration_text>\d+ mins)\D+(?<duration_value>\d+)/, body
in bleu (check the attached image), what I want to extract from body
body is the JSON response of my googleAPI url on a browser
Would you please assist and provide the regex ?
Since http://www.elixre.uk/ is down, i'm cant find any api helping to do that
Thanks in advance

Answer 1

Don't use regexes on a json string. Instead, convert the json string to an elixir map using Jason, Poison, etc., then use the keys in the map to lookup the data you are interested in.
Here's an example:
json_map = Jason.decode!(get_json())
[first_route | _rest] = json_map["routes"]
[first_leg | _rest] = first_route["legs"]
distance = first_leg["distance"]
=> %{"text" => "189 km", "value" => 188507}
Similarly, you can get the other parts with:
duration = first_leg["duration"]
end_address = first_leg["end_address"]
...
...