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feat(analytics): add client-side gtag.js to root layout #60

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Merged
Woody4618 merged 1 commit into from
May 25, 2026
+36 −0
Merged

feat(analytics): add client-side gtag.js to root layout #60

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8 changes: 8 additions & 0 deletions .env.example
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Original file line number Diff line number Diff line change
Expand Up @@ -116,3 +116,11 @@ GA4_MEASUREMENT_ID=
# Protocol API secrets. Leaking it lets anyone forge events into your GA4
# property. Required only if GA4_MEASUREMENT_ID is set.
GA4_API_SECRET=

# [PUBLIC] [optional] GA4 Measurement ID for client-side gtag.js page-view
# tracking. Format: "G-XXXXXXXXXX". Inlined into the bundle at build time
# via the NEXT_PUBLIC_ prefix — served to every visitor in the gtag.js
# script src, so not sensitive. When unset, app/layout.tsx skips rendering
# the GA4 <Script> tags entirely. Typically the same value as
# GA4_MEASUREMENT_ID (same GA4 property) — keep them in sync.
NEXT_PUBLIC_GA4_MEASUREMENT_ID=
20 changes: 20 additions & 0 deletions app/layout.tsx
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@@ -1,5 +1,6 @@
import type { Metadata } from "next";
import { Inter } from "next/font/google";
import Script from "next/script";
import { Header } from "@/components/header";
import { Footer } from "@/components/ui/footer";
import "./globals.css";
Expand All @@ -26,6 +27,8 @@ export default function RootLayout({
}: {
children: React.ReactNode;
}) {
const gaId = process.env.NEXT_PUBLIC_GA4_MEASUREMENT_ID;

return (
<html lang="en">
<body className={`${inter.className}`}>
Expand All @@ -36,6 +39,23 @@ export default function RootLayout({
</section>

<Footer />

{gaId && (
<>
<Script
src={`https://www.googletagmanager.com/gtag/js?id=${gaId}`}
strategy="afterInteractive"
/>
<Script id="ga4-init" strategy="afterInteractive">
{`
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', '${gaId}');
`}
</Script>
</>
)}
</body>
</html>
);
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8 changes: 8 additions & 0 deletions types.d.ts
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Expand Up @@ -43,6 +43,14 @@ declare namespace NodeJS {
GA4_MEASUREMENT_ID: string;
GA4_API_SECRET: string;

/**
* Client-side analytics (gtag.js). Optional — the GA4 <Script>
* tags in app/layout.tsx render only when this is set. Public by
* design (served to every visitor in the script src), so safe to
* expose with the NEXT_PUBLIC_ prefix.
*/
NEXT_PUBLIC_GA4_MEASUREMENT_ID: string;

/**
* Auth related variables
*/
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