how to add google analytics to nextjs code example

Example 1: google analytics analytics next.js

do the following in _document.js or wherever you defined Head:

<Head>
  <script
    async
    src="https://www.googletagmanager.com/gtag/js?id=[Tracking ID]"
  />

  <script
    dangerouslySetInnerHTML={{
      __html: `
            window.dataLayer = window.dataLayer || [];
            function gtag(){dataLayer.push(arguments);}
            gtag('js', new Date());
            gtag('config', '[Tracking ID]');
        `,
    }}
  />
</Head>

Example 2: google analytics nextjs

import { AppProps } from "next/app";
import { useRouter } from "next/router";
import { useEffect } from "react";
import * as gtag from "../lib/gtag";
const isProduction = process.env.NODE_ENV === "production";

const App = ({ Component, pageProps }: AppProps): JSX.Element => {
  const router = useRouter();

  useEffect(() => {
    const handleRouteChange = (url: URL) => {
      /* invoke analytics function only for production */
      if (isProduction) gtag.pageview(url);
    };
    router.events.on("routeChangeComplete", handleRouteChange);
    return () => {
      router.events.off("routeChangeComplete", handleRouteChange);
    };
  }, [router.events]);
  // eslint-disable-next-line react/jsx-props-no-spreading
  return <Component {...pageProps} />;
};

export default App;

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