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Google analytics setup example at Next.js with TypeScript
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| // pages/_document.tsx | |
| // And setup to next.config.js ↓↓↓ | |
| /* | |
| module.exports = { | |
| publicRuntimeConfig: { | |
| TRACKING_ID: process.env.TRACKING_ID || '', | |
| }, | |
| serverRuntimeConfig: { | |
| TRACKING_ID: process.env.TRACKING_ID || '', | |
| }, | |
| }; | |
| */ | |
| // Reference: https://nextjs.org/docs/api-reference/next.config.js/runtime-configuration | |
| import Document, { Html, Head, Main, NextScript } from 'next/document'; | |
| import getConfig from 'next/config'; | |
| const { publicRuntimeConfig, serverRuntimeConfig } = getConfig(); | |
| const trackingId: string = publicRuntimeConfig.TRACKING_ID || serverRuntimeConfig.TRACKING_ID; | |
| export default class MyDocument extends Document { | |
| render() { | |
| return ( | |
| <Html> | |
| <Head> | |
| {trackingId && ( | |
| <> | |
| <script | |
| async | |
| src={`https://www.googletagmanager.com/gtag/js?id=${trackingId}`} | |
| /> | |
| <script | |
| dangerouslySetInnerHTML={{ | |
| __html: ` | |
| window.dataLayer = window.dataLayer || []; | |
| function gtag(){dataLayer.push(arguments);} | |
| gtag('js', new Date()); | |
| gtag('config', '${trackingId}', { | |
| page_path: window.location.pathname, | |
| }); | |
| `, | |
| }} | |
| /> | |
| </> | |
| )} | |
| </Head> | |
| <body> | |
| <Main /> | |
| <NextScript /> | |
| </body> | |
| </Html> | |
| ); | |
| } | |
| } |
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