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Atlas Whoff

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How to Add Google Analytics to Next.js 14 (App Router)

#javascript #nextjs #webdev #tutorial

How to Add Google Analytics to Next.js 14 (App Router)

Google Analytics in Next.js App Router requires a specific setup — the old _app.js pattern doesn't exist. Here's the correct implementation that handles page views on navigation without double-counting.

Setup 

npm install @next/third-parties
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@next/third-parties is the official Next.js package for third-party scripts. For GA4, it handles script loading, page view tracking, and performance optimization.

Add to Root Layout

app/layout.tsx:

import { GoogleAnalytics } from '@next/third-parties/google';

export default function RootLayout({
  children,
}: {
  children: React.ReactNode;
}) {
  return (
    <html lang='en'>
      <body>{children}</body>
      {process.env.NODE_ENV === 'production' && (
        <GoogleAnalytics gaId={process.env.NEXT_PUBLIC_GA_ID!} />
      )}
    </html>
  );
}
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.env.local:

NEXT_PUBLIC_GA_ID=G-XXXXXXXXXX
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The NODE_ENV === 'production' check prevents GA events from firing in development. Without it, your dev traffic pollutes your analytics data.

Page View Tracking

GoogleAnalytics from @next/third-parties handles page views automatically on client-side navigation — no extra code needed.

Custom Events 

import { sendGAEvent } from '@next/third-parties/google';

// Track a button click
function PricingButton() {
  return (
    <button
      onClick={() => sendGAEvent('event', 'purchase_intent', {
        plan: 'pro',
        location: 'pricing_page'
      })}
    >
      Get Pro
    </button>
  );
}

// Track a conversion
function handleCheckoutSuccess() {
  sendGAEvent('event', 'purchase', {
    currency: 'USD',
    value: 99,
    items: [{ item_id: 'ai-saas-starter', item_name: 'AI SaaS Starter Kit' }]
  });
}
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Alternative: Script Tag Approach

If you need more control over loading behavior:

import Script from 'next/script';

export default function RootLayout({ children }: { children: React.ReactNode }) {
  const gaId = process.env.NEXT_PUBLIC_GA_ID;

  return (
    <html lang='en'>
      <body>
        {children}
        {gaId && process.env.NODE_ENV === 'production' && (
          <>
            <Script
              src={`https://www.googletagmanager.com/gtag/js?id=${gaId}`}
              strategy='afterInteractive'
            />
            <Script id='ga-init' strategy='afterInteractive'>
              {`
                window.dataLayer = window.dataLayer || [];
                function gtag(){dataLayer.push(arguments);}
                gtag('js', new Date());
                gtag('config', '${gaId}', { page_path: window.location.pathname });
              `}
            </Script>
          </>
        )}
      </body>
    </html>
  );
}
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Use strategy='afterInteractive' to load GA after the page is interactive — this prevents GA from blocking page render.

PostHog: The Better Alternative for AI SaaS

For AI SaaS specifically, PostHog is often a better fit than GA4:

  • Session recordings show exactly how users interact with your AI features
  • Feature flags let you A/B test AI prompts or UI variants
  • Funnel analysis tracks conversion from free → paid
  • Open source, self-hostable option available 
npm install posthog-js
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// app/providers.tsx
'use client';

import posthog from 'posthog-js';
import { PostHogProvider } from 'posthog-js/react';
import { useEffect } from 'react';

export function PHProvider({ children }: { children: React.ReactNode }) {
  useEffect(() => {
    posthog.init(process.env.NEXT_PUBLIC_POSTHOG_KEY!, {
      api_host: '/ingest',  // proxy through Next.js to avoid ad blockers
      capture_pageview: false,  // manual control
    });
  }, []);

  return <PostHogProvider client={posthog}>{children}</PostHogProvider>;
}
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Pre-Configured in the Starter Kit

The AI SaaS Starter Kit ships with GA4 + PostHog both pre-configured in the root layout — toggle each via env vars.

AI SaaS Starter Kit — $99

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