Firebase Realtime Database: Set Region Implementation Guide

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Creating a Custom Region Firebase Realtime Database in JavaScript: A Step-by-Step Guide.

1. create javascript as you want.

2. implement latest version libraries.
    <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-database.js"></script>

3. Copy configuration from project settings > general > apps > config.

4. Implement in your javascript.

5. Here, in the database URL, the region is mentioned.

Note : libraries must be latest.

Demo,
  <!DOCTYPE html>
<html>
<head>
  <title>Firebase Realtime Database Example</title>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-app.js"></script>
  <script src="https://www.gstatic.com/firebasejs/8.10.0/firebase-database.js"></script>
</head>
<body>
  <h1>Firebase Realtime Database Example</h1>

  <script>
    // Initialize Firebase
    var firebaseConfig = {
      apiKey: "YOUR_API_KEY",
      authDomain: "YOUR_AUTH_DOMAIN",
      databaseURL: "YOUR_DATABASE_URL",
      projectId: "YOUR_PROJECT_ID",
      storageBucket: "YOUR_STORAGE_BUCKET",
      messagingSenderId: "YOUR_MESSAGING_SENDER_ID",
      appId: "YOUR_APP_ID"
    };
    firebase.initializeApp(firebaseConfig);

    // Get a reference to the database
    var database = firebase.database();

    // Fetch data from the database
    database.ref("data").on("value", function(snapshot) {
      var data = snapshot.val();
      console.log(data); // Do something with the fetched data
    });

    // Update data in the database
    var newData = {
      name: "John Doe",
      age: 25,
      email: "johndoe@example.com"
    };
    database.ref("data").set(newData);
  </script>
</body>
</html>


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