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libraries/ESP32_Firebase/examples/FirebaseJsonDemo/FirebaseJsonDemo.ino

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+/*
+  Make sure your Firebase project's '.read' and '.write' rules are set to 'true'. 
+  Ignoring this will prevent the MCU from communicating with the database. 
+  For more details- https://github.com/Rupakpoddar/ESP32Firebase 
+*/
+
+#include <ArduinoJson.h>            // https://github.com/bblanchon/ArduinoJson 
+#include <ESP32Firebase.h>
+
+#define _SSID "ENTER HERE"          // Your WiFi SSID 
+#define _PASSWORD "ENTER HERE"      // Your WiFi Password 
+#define REFERENCE_URL "ENTER HERE"  // Your Firebase project reference url 
+
+Firebase firebase(REFERENCE_URL);
+
+void setup() {
+  Serial.begin(115200);
+  // pinMode(LED_BUILTIN, OUTPUT);
+  // digitalWrite(LED_BUILTIN, LOW);
+  WiFi.mode(WIFI_STA);
+  WiFi.disconnect();
+  delay(1000);
+
+  // Connect to WiFi
+  Serial.println();
+  Serial.println();
+  Serial.print("Connecting to: ");
+  Serial.println(_SSID);
+  WiFi.begin(_SSID, _PASSWORD);
+
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print("-");
+  }
+
+  Serial.println("");
+  Serial.println("WiFi Connected");
+
+  // Print the IP address
+  Serial.print("IP Address: ");
+  Serial.print("http://");
+  Serial.print(WiFi.localIP());
+  Serial.println("/");
+  // digitalWrite(LED_BUILTIN, HIGH);
+
+//================================================================//
+//================================================================//
+
+  // Write some data to the realtime database.
+  firebase.setString("Example/setString", "It's Working");
+  firebase.setInt("Example/setInt", 123);
+  firebase.setFloat("Example/setFloat", 45.32);
+
+  firebase.json(true);              // Make sure to add this line.
+  
+  String data = firebase.getString("Example");  // Get data from the database.
+
+  // Deserialize the data.
+  // Consider using Arduino Json Assistant- https://arduinojson.org/v6/assistant/
+  const size_t capacity = JSON_OBJECT_SIZE(3) + 50;
+  DynamicJsonDocument doc(capacity);
+
+  deserializeJson(doc, data);
+
+  // Store the deserialized data.
+  const char* received_String = doc["setString"]; // "It's Working"
+  int received_int = doc["setInt"];               // 123
+  float received_float = doc["setFloat"];         // 45.32
+
+  // Print data
+  Serial.print("Received String:\t");
+  Serial.println(received_String);
+
+  Serial.print("Received Int:\t\t");
+  Serial.println(received_int);
+
+  Serial.print("Received Float:\t\t");
+  Serial.println(received_float);
+
+  // Delete data from the realtime database.
+  firebase.deleteData("Example");
+}
+
+void loop() {
+  // Nothing
+}