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Google Tag Manager Event Streaming

Google Tag Manager is a platform to manage all your website's tags without code.

Setup

Amplitude plugin setup

A variant of an Amplitude Destination Plugin is required to forward events to Google Tag Manager. Below is a template of a Destination Plugin tailored for Google Tag Manager. It creates an instance of the Google Tag Manager browser snippet and forwards tracked events from Amplitude's SDK. This template is customizable for any needs.

import { DestinationPlugin, Event, PluginType, Result } from '@amplitude/analytics-types';

export class GTMPlugin implements DestinationPlugin {
  name = 'google-tag-manager';
  type = PluginType.DESTINATION as const;
  containerId: string;

  constructor(containerId: string) {
    this.containerId = containerId;
  }

  async setup(): Promise<void> {
    if (!window.dataLayer) {
      window.dataLayer = window.dataLayer || [];
      window.dataLayer.push({ 'gtm.start': new Date().getTime(), event: 'gtm.js' });
      const head = document.getElementsByTagName('head')[0],
        script = document.createElement('script'),
        dataLayer = 'datalayer' != 'dataLayer' ? '&l=' + 'datalayer' : '';
      script.async = true;
      script.src = 'https://www.googletagmanager.com/gtm.js?id=' + this.containerId + dataLayer;
      head.insertBefore(script, head.firstChild);
    }
  }

  async execute(event: Event): Promise<Result> {
    window.dataLayer.push(event);

    return {
      code: 200,
      event: event,
      message: 'Event pushed onto GTM Data Layer',
    };
  }
}

Amplitude plugin usage

Inside the app's code, the plugin may then be imported and added to the Amplitude SDK instance.

import * as amplitude from '@amplitude/analytics-browser';
import { GTMPlugin } from './GTMPlugin';

amplitude.init(AMPLITUDE_API_KEY);
amplitude.add(new GTMPlugin(GOOGLE_TAG_MANAGER_CONTAINER_ID));

amplitude.logEvent('open app');
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