#include <ArduinoJson.h>

void setup() {
  Serial.begin(9600);

   DynamicJsonDocument  jsonBuffer(200);
   
   String json =
      "{\"sensor\":\"gps\",\"time\":1351824120,\"data\":[48.756080,2.302038]}";
   deserializeJson(jsonBuffer, json);
    JsonObject root = jsonBuffer.as<JsonObject>();
 
  const char* sensor = root["sensor"];
  long time = root["time"];
  double latitude = root["data"][0];
  double longitude = root["data"][1];

  Serial.println();
  Serial.println(sensor);
  Serial.println(time);
  Serial.println(latitude, 6);
  Serial.println(longitude, 6);
}

void loop() { 
}