Passing JsonDocument by reference about arduinojson HOT 4 CLOSED

  #include <WiFi.h>
  #include <HTTPClient.h>
  #include <ArduinoJson.h>
  
  const char* ssid = "...";
  const char* password = "...";
  
  bool filteredJsonGet(String &url, JsonDocument &result, JsonDocument &filter) {
    HTTPClient http;
    http.useHTTP10(true);
    http.begin(url);
    Serial.println("About to get");
    int httpCode = http.GET();
    Serial.println("Got");
  
    if(httpCode != 200) {
      Serial.print("GET failed ");
      Serial.print(httpCode);
      Serial.print(" - ");
      Serial.println(url);
  
      http.end();
  
      return false;
    } else {
      Serial.println("HTTP Success");
      DeserializationError error = deserializeJson(result, http.getStream(), DeserializationOption::Filter(filter));
      Serial.println("Deserialized json");
  
      http.end();
  
      if (error) {
        Serial.print("GET failed ");
        Serial.print(url);
        Serial.print(" - deserializeJson() failed: ");
        Serial.println(error.c_str());
        return false;
      }
  
      if (result.overflowed()) {
        Serial.print("GET failed ");
        Serial.print(url);
        Serial.println(" - Ran out of memory for JsonDocument");
        return false;
      }
  
      Serial.println("No json errors");
    }

+   return true;    
  }
  
  void setup() {
    Serial.begin(115200);
    
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
    }
  
    String url = "http://worldtimeapi.org/api/timezone/America/Chicago";
  
    JsonDocument filter;
    filter["unixtime"] = true;
  
    JsonDocument result;
  
    if(filteredJsonGet(url, result, filter)) {
      Serial.print("Success ");
-     Serial.println(result["unixtime"].as<const char*>());
+     Serial.println(result["unixtime"].as<unsigned long>());
    } else {
      Serial.println("Fail");
    }
  }
  
  void loop() {
    // put your main code here, to run repeatedly:
  
  }