I'm writing some script for ESP32 and struggling to serialize a json.
Used libraries are HTTPClient and ArduinoJson.
String payload = http.getString();
Serial.println(payload);
deserializeJson(result, payload);
const char* usuario = result["user"];
Serial.println("##########");
Serial.println(usuario);
The received payload is:
{"ip":"10.57.39.137","area":"[{\"id\":\"3\",\"text\":\"BOX\"}]","user":"[{\"id\":\"6270\",\"text\":\"ANDRE LARA OLIVEIRA E SILVA\"}]","teamId":6,"id":4,"siteId":2,"userCreate":"100059527","dateCreate":"2020-11-19T08:49:03.957","userUpdate":null,"dateUpdate":null}
I need to retrieve id and text from "user" key. It's fine to deserialize and retrieve user object. But result["user"] returns: [{"id":"6270","text":"ANDRE LARA OLIVEIRA E SILVA"}] to the char array. So it's something like a json nested in an array... and it's not working out to deserialize.
Can anyone help me how to properly get the "id" and "text" values from "user" object?
The library doesn't know the content of that string is valid JSON, so you have re-parse it. This code worked for me on my PC, though I don't have an Arduino to test it on:
auto payload = "..."; // JSON content here
StaticJsonDocument<1024> result;
deserializeJson(result, payload);
auto user = result["user"].as<const char*>();
StaticJsonDocument<256> userObj;
deserializeJson(userObj, user);
auto id = userObj[0]["id"].as<int>();
auto text = userObj[0]["text"].as<const char*>();