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Showing content from https://developers.google.com/analytics/devguides/collection/firebase/ios below:

Get started with Google Analytics

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This quickstart shows you how to add Google Analytics to your app and begin logging events.

Google Analytics collects usage and behavior data for your app. The SDK logs two primary types of information:

Events: What is happening in your app, such as user actions, system events, or errors.
User properties: Attributes you define to describe segments of your user base, such as language preference or geographic location.

Analytics automatically logs some events and user properties; you don't need to add any code to enable them.

Before you begin

If you haven't already, add Firebase to your JavaScript project and make sure that Google Analytics is enabled in your Firebase project:

If you're creating a new Firebase project, enable Google Analytics during the project creation workflow.
If you're using an existing Firebase project that doesn't have Google Analytics enabled, go to the Integrations tab of your settings > Project settings to enable it.

Warning: Any Firebase project created before July 31, 2019 must be upgraded to the full Google Analytics 4 experience if it hasn't already. (Banners display in the Analytics dashboard if an upgrade is required.) The associated Terms of Service must be accepted by February 15, 2022 to ensure data collection continues. See the Support FAQ on the upgrade for help finding project Owners.

When you enable Google Analytics in your project, your Firebase web apps are linked to Google Analytics data streams associated with an App + Web property.

Add the Analytics SDK to your app

Depending on how your web application is hosted, your configuration may be handled automatically or you may need to update your Firebase configuration object. If your web app already uses Google Analytics, you may need to do additional setup described in Use Firebase with existing gtag.js tagging.

Check that your Firebase config object in your code contains measurementId. This ID is automatically created when you enable Analytics in your Firebase project and register a web app, and it's required to use Analytics.
Note: For apps using the Firebase JavaScript SDK v7.20.0 and later, Firebase dynamically fetches the measurementId when your app initializes Analytics. Having this ID in your config object is optional, but it does serve as a fallback in the rare case that the dynamic fetch fails.
- If your app uses Firebase Hosting and uses reserved URLs for the Firebase SDKs:
  
  Firebase automatically handles configuring your application. To complete setup, add the scripts from the Your apps card in your Project settings to the <body> tag of your app, if you haven't already.
- If your app does not use reserved URLs: If you're working with an existing web app, update the Firebase config object in your code to ensure the measurementId field is present. The config object should look similar to the following example:
```
// For Firebase JavaScript SDK v7.20.0 and later, `measurementId` is an optional field
const firebaseConfig = {
  apiKey: "API_KEY",
  authDomain: "PROJECT_ID.firebaseapp.com",
  databaseURL: "https://PROJECT_ID.firebaseio.com",
  projectId: "PROJECT_ID",
  storageBucket: "PROJECT_ID.firebasestorage.app",
  messagingSenderId: "SENDER_ID",
  appId: "APP_ID",
  measurementId: "G-GA_MEASUREMENT_ID"
};
```
If you haven't already, install the Firebase JS SDK and initialize Firebase.
Add the Analytics JS SDK and initialize Analytics:

Web Learn more about the tree-shakeable modular web API and upgrade from the namespaced API.

import { initializeApp } from "firebase/app";
import { getAnalytics } from "firebase/analytics";

// TODO: Replace the following with your app's Firebase project configuration
// See: https://firebase.google.com/docs/web/learn-more#config-object
const firebaseConfig = {
  // ...
};

// Initialize Firebase
const app = initializeApp(firebaseConfig);


// Initialize Analytics and get a reference to the service
const analytics = getAnalytics(app);

Web Learn more about the tree-shakeable modular web API and upgrade from the namespaced API.

import firebase from "firebase/compat/app";
import "firebase/compat/analytics";

// TODO: Replace the following with your app's Firebase project configuration
// See: https://firebase.google.com/docs/web/learn-more#config-object
const firebaseConfig = {
  // ...
};

// Initialize Firebase
firebase.initializeApp(firebaseConfig);


// Initialize Analytics and get a reference to the service
const analytics = firebase.analytics();

Use Firebase with existing gtag.js tagging

If you previously had Google Analytics running in your app using the gtag.js snippet, your app may require additional setup if you plan to do one of the following:

Add Google Analytics calls from Firebase to the page but also plan to continue using gtag() calls directly on the same page.
Want to use the same measurement ID between both direct gtag() calls and Google Analytics data sent to Firebase.

To ensure your events are available for use by all Firebase services, complete the following additional setup steps:

Remove the line gtag('config', 'GA_MEASUREMENT_ID'); where the GA_MEASUREMENT_ID is the measurementId of your Firebase web app. If you have other IDs for other Analytics properties on the page, you do not need to remove their config line.
Make sure you call firebase.analytics() before you send any events with gtag().

Otherwise, events sent to that ID with gtag() calls will not be associated with Firebase and will not be available for targeting in other Firebase services.

Start logging events

After you have initialized the Analytics service, you can begin to log events with the logEvent() method.

Certain events are recommended for all apps; others are recommended for specific business types or verticals. You should send suggested events along with their prescribed parameters, to ensure maximum available detail in your reports and to benefit from future features and integrations as they become available. This section demonstrates logging a pre-defined event, for more information on logging events, see Log events.

The following example demonstrates how to log a recommended event to indicate a user has received a notification in your app:

Web

import { getAnalytics, logEvent } from "firebase/analytics";

const analytics = getAnalytics();
logEvent(analytics, 'notification_received');

Web

firebase.analytics().logEvent('notification_received');

Next steps

Understand each Analytics report.
Use the DebugView to verify your events.
Explore your data in the Firebase console.
Explore the guides on events and user properties.
Learn how to export your data to BigQuery.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-05-08 UTC.

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