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https://github.com/derrickreimer/fathom-client

A Fathom Analytics library to help with client-side routing
https://github.com/derrickreimer/fathom-client

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A Fathom Analytics library to help with client-side routing

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README 

        
# Fathom Client [![CircleCI](https://circleci.com/gh/derrickreimer/fathom-client.svg?style=svg)](https://circleci.com/gh/derrickreimer/fathom-client)



This library is a JavaScript client for [Fathom Analytics](https://usefathom.com/).



- **Asynchronous script loading.** We provide a `load` function that will asynchronously inject the Fathom `` tag (great for single-page app environments).

- **`import`-able tracking functions.** We provide tracking functions (`trackPageview` and `trackEvent`) that you can import and safely call anywhere (even if the Fathom script has not yet finished loading).



---



Maintained with ♥️ by the [SavvyCal](https://savvycal.com/?utm_source=github&utm_medium=oss&utm_campaign=fathom-client) team



## Installation



Run the following to install in your project:



```

npm install fathom-client

```



## Motivation



The standard installation flow for Fathom is to drop their snippet on your page, which will automatically load the library and track a pageview. This approach works great for server-rendered sites with full page refreshes, but gets tricky when:



- Routing happens on the client-side (e.g. an SPA)

- The DOM is abstracted away (e.g. Next.js)



This library provides an interface you can use to orchestrate Fathom calls at various points in your page lifecycle:



```js

import * as Fathom from 'fathom-client';



// Upon initial page load...

Fathom.load('MY_FATHOM_ID');



// In the route changed event handler...

const onRouteChangeComplete = () => {

  Fathom.trackPageview();

};



// In an event handler where a goal is achieved...

const onSignUp = () => {

  Fathom.trackEvent('Sign Up');

};

```



## API Reference



### `load(siteId: string, opts?: object)`



Injects the Fathom script into the DOM and loads the script asynchronously.



#### Arguments



- `siteId` - The site ID provided in the Fathom UI.

- `opts` - An Object of options:

  - `auto` - When `false`, skips automatically tracking page views on script load (defaults to `true`).

  - `honorDNT` - When `true`, honors the [DNT header](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/DNT) in the visitor's browser

  - `canonical` - When `false`, ignores the canonical tag if present (defaults to `true`).

  - `spa` - Accepts one of the following values: `auto`, `history`, or `hash` (see [advanced docs](https://usefathom.com/support/tracking-advanced)).



#### Example



```js

import { load } from 'fathom-client';



load('MY_FATHOM_ID', {

  // Add options here

});

```



### `trackPageview(opts?: object)`



Tracks a pageview.



#### Arguments



- `opts` - An Object of options:

  - `url` - When set, overrides `window.location`.

  - `referrer` - When set, overrides `document.referrer`.



#### Example



```js

import { trackPageview } from 'fathom-client';



trackPageview();

```



### `trackEvent(eventName: string, opts?: object)`



Tracks an event.



See [Creating and using events](https://usefathom.com/docs/features/events).



#### Arguments



- `eventName` - This can be nearly anything you want. Avoid special chars and emojis.

- `opts` - An Object of options:

  - `_site_id` - The Fathom site ID.

  - `_value` - The value of the event (in cents).



#### Example



```js

import { trackEvent } from 'fathom-client';



trackEvent('checkout completed', { _value: 100 });

```



### `trackGoal(code: string, cents: number)`



Tracks a goal. **This is now deprecated, see `trackEvent` instead**.



#### Arguments



- `code` - the code provided in the Fathom UI.

- `cents` - the value of the goal conversion.



#### Example



```js

import { trackGoal } from 'fathom-client';



trackGoal('MY_GOAL_CODE', 100);

```



### `enableTrackingForMe()`



Enables tracking for the current visitor.



See https://usefathom.com/docs/features/exclude.



#### Arguments



None.



#### Example



```js

import { enableTrackingForMe } from 'fathom-client';



enableTrackingForMe();

```



### `blockTrackingForMe()`



Blocks tracking for the current visitor.



See https://usefathom.com/docs/features/exclude.



#### Arguments



None.



#### Example



```js

import { blockTrackingForMe } from 'fathom-client';



blockTrackingForMe();

```



### `isTrackingEnabled()`



Checks if tracking is enabled for the current visitor.



See https://usefathom.com/docs/features/exclude.



#### Arguments



None.



#### Returns



Boolean.



#### Example



```js

import { isTrackingEnabled } from 'fathom-client';



const check = isTrackingEnabled(); // `true` by default

```



### `setSite(id: string)`



Sets the site ID for tracking (overrides the ID used when loading Fathom).



#### Arguments



- `id` - The site ID provided in the Fathom UI.



#### Example



```js

import { load, setSite } from 'fathom-client';



load('MY_FATHOM_ID');



setSite('A_DIFFERENT_FATHOM_ID');

```



## Allowed Domains



Manage your allowed domains within your Fathom site's Firewall settings. Doing so enables the usage of wildcards (e.g., \*.example.com). See https://usefathom.com/docs/script/firewall#allowed



The `includedDomains` and `excludedDomains` options, while deprecated, are still supported to ensure backward compatibility.



## Usage



This library is JavaScript framework-agnostic. Below are some usage examples with popular frameworks.



### Next.js



#### Using `pages` directory (v12 and older)



> If you are using the latest Next.js beta with the `app` directory, see the modified instructions below.



Create an `_app.js` file in your `pages` directory, [like this](https://nextjs.org/docs#custom-app):



```jsx

import React, { useEffect } from 'react';

import Router from 'next/router';

import * as Fathom from 'fathom-client';



// Record a pageview when route changes

Router.events.on('routeChangeComplete', (as, routeProps) => {

  if (!routeProps.shallow) {

    Fathom.trackPageview();

  }

});



function App({ Component, pageProps }) {

  // Initialize Fathom when the app loads

  useEffect(() => {

    Fathom.load('MY_FATHOM_ID', {

      // Add options here

    });

  }, []);



  return <Component {...pageProps} />;

}



export default App;

```



#### Using the experimental `app` directory (v13)



Create a `Fathom` client component:



```tsx

// Fathom.tsx

'use client';



import { load, trackPageview } from 'fathom-client';

import { useEffect, Suspense } from 'react';

import { usePathname, useSearchParams } from 'next/navigation';



function TrackPageView() {

  const pathname = usePathname();

  const searchParams = useSearchParams();



  // Load the Fathom script on mount

  useEffect(() => {

    load('MY_FATHOM_ID', {

      auto: false

    });

  }, []);



  // Record a pageview when route changes

  useEffect(() => {

    if (!pathname) return;



    trackPageview({

      url: pathname + searchParams?.toString(),

      referrer: document.referrer

    });

  }, [pathname, searchParams]);



  return null;

}



export default function Fathom() {

  return (

    <Suspense fallback={null}>

      <TrackPageView />

    </Suspense>

  );

}

```



Note that we explicitly pass the `url` to `trackPageview` to avoid race conditions that occur when we allow the Fathom script to infer the URL from the browser.



Then, add the client component to your root `layout.tsx` file:



```tsx

// layout.tsx



import Fathom from './Fathom';



export default function RootLayout({ children }: { children: ReactNode }) {

  return (

    <html lang="en">

      <head></head>

      <body>

        <Fathom />

        {children}

      </body>

    </html>

  );

}

```



## Upgrading to 3.x



The 3.0 release comes with a new way to load Fathom:



```diff

- Fathom.load();

- Fathom.setSiteId('MY_FATHOM_ID');

+ Fathom.load('MY_FATHOM_ID');

```



The `load` function also accepts an object of options:



```js

Fathom.load('MY_FATHOM_ID', {

  // Add options here

});

```



See [advanced options for tracking](https://usefathom.com/support/tracking-advanced).



## Releasing



Run the following to publish a new version:



```bash

npm run release

```