Sample code for calling retrieving JSON data from a REST API endpoint with JSON with headers

rest_api_test.ino

/* Note: You'll need to install the ArduinoJson library first before this will work
   See https://www.youtube.com/watch?v=GUTpaY1YaXo for a 30-sec video showing how
   More examples here: https://arduinojson.org/v6/how-to/use-arduinojson-with-esp8266httpclient/
*/

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>

// WiFi credentials
const char* ssid = "WIFI_NETWORK_NAME";
const char* password = "WIFI_NETWORK_PASSWORD";

void setup() 
{
  // Connect to WiFi
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) 
  {
    delay(1000);
    Serial.println("Connecting...");
  }
}

void loop() 
{
  if (WiFi.status() == WL_CONNECTED) 
  {
    HTTPClient http;

    // Login to Home Assistant
    http.begin("URL_GOES_HERE");
    http.addHeader("Authorization", "Bearer API_KEY_GOES_HERE");
    http.addHeader("Content-Type", "application/json");
    http.GET();
    
    // Parse response
    DynamicJsonDocument doc(2048);
    deserializeJson(doc, http.getStream());
    
    // Read values
    Serial.println(doc["attributes"]["media_artist"].as<char*>());
    Serial.println(doc["attributes"]["media_title"].as<char*>());
  
    // Disconnect
    http.end();
  }
  delay(60000);
}