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gatsby-plugin-google-tagmanager

Easily add Google Tagmanager to your Gatsby site.

Install

npm install --save gatsby-plugin-google-tagmanager

How to use

// In your gatsby-config.js
plugins: [
  {
    resolve: "gatsby-plugin-google-tagmanager",
    options: {
      id: "YOUR_GOOGLE_TAGMANAGER_ID",

      // Include GTM in development.
      //
      // Defaults to false meaning GTM will only be loaded in production.
      includeInDevelopment: false,

      // datalayer to be set before GTM is loaded
      // should be an object or a function that is executed in the browser
      //
      // Defaults to null
      defaultDataLayer: { platform: "gatsby" },

      // Specify optional GTM environment details.
      gtmAuth: "YOUR_GOOGLE_TAGMANAGER_ENVIRONMENT_AUTH_STRING",
      gtmPreview: "YOUR_GOOGLE_TAGMANAGER_ENVIRONMENT_PREVIEW_NAME",
      dataLayerName: "YOUR_DATA_LAYER_NAME",

      // Name of the event that is triggered
      // on every Gatsby route change.
      //
      // Defaults to gatsby-route-change
      routeChangeEventName: "YOUR_ROUTE_CHANGE_EVENT_NAME",
    },
  },
]

If you like to use data at runtime for your defaultDataLayer you can do that by defining it as a function.

// In your gatsby-config.js
plugins: [
  {
    resolve: "gatsby-plugin-google-tagmanager",
    options: {
      // datalayer to be set before GTM is loaded
      // should be a stringified object or object
      //
      // Defaults to null
      defaultDataLayer: function () {
        return {
          pageType: window.pageType,
        }
      },
    },
  },
]

This plugin only initiates the tag manager container. If you want to use Google Analytics, please also add gatsby-plugin-google-analytics.

If you want to link analytics use with anything inside the container (for example, a cookie consent manager such as OneTrust), you will need to ensure that the tag manager script comes before the analytics script in your gatsby-config.js.

Tracking routes

This plugin will fire a new event called gatsby-route-change (or as in the gatsby-config.js configured routeChangeEventName) whenever a route is changed in your Gatsby application. To record this in Google Tag Manager, we will need to add a trigger to the desired tag to listen for the event:

  1. Visit the Google Tag Manager console and click on the workspace for your site.
  2. Navigate to the desired tag using the ‘Tags’ tab of the menu on the right hand side.
  3. Under “Triggering”, click the pencil icon, then the ”+” button to add a new trigger.
  4. In the “Choose a trigger” window, click on the ”+” button again.
  5. Choose the trigger type by clicking the pencil button and clicking “Custom event”. For event name, enter gatsby-route-change (or as in the gatsby-config.js configured routeChangeEventName).

This tag will now catch every route change in Gatsby, and you can add Google tag services as you wish to it.

Note

Out of the box this plugin will simply load Google Tag Manager on the initial page/app load. It’s up to you to fire tags based on changes in your app. See the above “Tracking routes” section for an example.

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