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A lightweight & feature-rich Gatsby plugin to easily add Segment JS snippet to your site.

We need your help! 🙏🏽

We’re looking for active contributors to this repo! If you’re interested, simply open an issue or PR of your own and indicate that you’d like to help. Check out our open issues and PRs. We also need to beef up testing. Contributors get to:

  • manage versioning and deploys by publishing new versions to NPM
  • determine which features get launched by merging pull requests
  • oversee the community through commenting on and managing pull requests and issues

⚜️ Being an active contributor is great for the community and your engineering resume.⚜️


Packed with features:

  • use multiple write keys (one for prod env, another optional one for dev)
  • disable page view tracking (just in case you want to add it later manually)
  • will use a default Segment code snippet (currently v4.13.2), or you can provide your own custom snippet


  • NPM: $ npm install --save gatsby-plugin-segment-js
  • YARN: $ yarn add gatsby-plugin-segment-js

How to use


In your gatsby-config.js file:

plugins: [
    resolve: `gatsby-plugin-segment-js`,
    options: {
      // your segment write key for your production environment
      // when process.env.NODE_ENV === 'production'
      // required; non-empty string

      // if you have a development env for your segment account, paste that key here
      // when process.env.NODE_ENV === 'development'
      // optional; non-empty string
      devKey: 'SEGMENT_DEV_WRITE_KEY',

      // boolean (defaults to false) on whether you want
      // to include automatically
      // if false, see below on how to track pageviews manually
      trackPage: false,

      // number (defaults to 50); time to wait after a route update before it should
      // track the page change, to implement this, make sure your `trackPage` property is set to `true`
      trackPageDelay: 50,

      // If you need to proxy events through a custom endpoint,
      // add a `host` property (defaults to
      // Segment docs:
      //   -
      //   -
      host: 'https://override-segment-endpoint',

      // boolean (defaults to false); whether to delay load Segment
      // ADVANCED FEATURE: only use if you leverage client-side routing (ie, Gatsby <Link>)
      // This feature will force Segment to load _after_ either a page routing change
      // or user scroll, whichever comes first. This delay time is controlled by
      // `delayLoadTime` setting. This feature is used to help improve your website's
      // TTI (for SEO, UX, etc).  See links below for more info.
      // NOTE: But if you are using server-side routing and enable this feature,
      // Segment will never load (because although client-side routing does not do
      // a full page refresh, server-side routing does, thereby preventing Segment
      // from ever loading).
      // See here for more context:
      // GIF:
      // TTI:
      // Problem/solution:
      delayLoad: false,

      // number (default to 1000); time to wait after scroll or route change
      // To be used when `delayLoad` is set to `true`
      delayLoadTime: 1000,

      // Whether to completely skip calling `analytics.load({writeKey})`.
      // ADVANCED FEATURE: only use if you are calling `analytics.load({writeKey})` manually
      // elsewhere in your code or are using a library
      // like: that will call it for you.
      // Useful for only loading the tracking script once a user has opted in to being tracked, for example.
      manualLoad: false,

      // This package will use a default version of Segment's code snippet, but
      // if you'd like to include your own you can do so here. This is useful if
      // the version this package uses is different than the one you'd like to
      // use...or you need to do something custom.
      // While you should NOT use a back-ticked template string here, the string
      // will be evaluated as template literal with the following variables
      // available to it:
      //    - `writeKey`: The appropriate value from the `prodKey` and `devKey`
      //      options, based on the `NODE_ENV`
      //    - any of the other options passed here
      // NOTES: 
      // - If you provide a custom snippet, an immediate call to
      //   `analytics.load()` and/or `` will not be added by
      //   this plugin. You can - of course - add them yourself to your snippet.
      // - If your custom snippet does not include a call to `analytics.load()`
      //   then you must either:
      //   1. Manually load it and set the `manualLoad` option here to `true`
      //   2. Use the `delayLoad` option here
      customSnippet: '!function(){var||[];...;analytics.load("${writeKey}");;}}();'

Track Events

If you want to track events, you simply invoke Segment as normal in your React components — ('Event Name', {...}) — and you should see the events within your Segment debugger! For example, if you wanted to track events on a click, it may look something like this:

class IndexPage extends React.Component {
    _handleClick() {"Track Event Fired", {
            gender: 'male',
            age: 33,
    render() {
        return (
                <Link onClick={this._handleClick} to="/">
                    Click here
                </Link>{" "}
                to see a track event

Track Pageviews

If you want to track pageviews automatically, set trackPage to true in your gatsby-config.js file. What we mean by “automatically” is that whenever there is a route change, we leverage Gatsby’s onRouteUpdate API in the gatsby-browser.js file (link) to invoke on each route change. But if you want to pass in properties along with the pageview call (ie, it’s common to see folks pass in some user or account data with each page call), then you’ll have to set trackPage: false and call it yourself in your gatsby-browser.js file, like this:

// gatsby-browser.js
exports.onRouteUpdate = () => { &&;
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