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fix: hydration issue #40

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fix: hydration issue #40

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Theodore-Kelechukwu-Onyejiaku
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What does it do?

There is a hydration error on the Next.js frontend. The <html> and <body> tags are already defined in the root layout at ./next/app/layout.tsx, so they must not be included again in the locale-specific layout at ./next/app/[locale]/layout.tsx.

// Path: ./next/app/layout.tsx

export default function RootLayout({
  children,
  params,
}: {
  children: React.ReactNode;
  params: { lang: Locale };
}) {
  return (
    <html lang={params.lang} suppressHydrationWarning>
      <body suppressHydrationWarning>
        <SlugProvider>
          {children}
        </SlugProvider>
      </body>
    </html>
  );
}

Why is it needed?

After setting up Launchpad, a hydration error is thrown on the frontend:

hydration error
hydration error details

Including multiple or tags in nested layouts will cause errors in Next.js (App Router), as these tags are meant to be defined once globally.

❌ What to Remove
Avoid wrapping the locale layout in another <html> or <body>:

// Path: ./next/app/[locale]/layout.tsx

return (
  <html lang={locale}>
    <ViewTransitions>
      <CartProvider>
        <body className="...">
          <Navbar ... />
          {children}
          <Footer ... />
        </body>
      </CartProvider>
    </ViewTransitions>
  </html>
);

✅ Updated Locale Layout
Instead, use a <div> or <main> container:

// Path: ./next/app/[locale]/layout.tsx

return (
  <ViewTransitions>
    <CartProvider>
      <div
        className={cn(
          inter.className,
          "bg-charcoal antialiased h-full w-full"
        )}
      >
        <Navbar data={pageData.navbar} locale={locale} />
        {children}
        <Footer data={pageData.footer} locale={locale} />
      </div>
    </CartProvider>
  </ViewTransitions>
);

How to test it?

Simply make sure the whole Strapi application doesn't crash and the connected Next.js application is fully working.

Some additional things to check:

  • Strapi project uuid is "LAUNCHPAD". strapi/packages.json.
  • If you updated content, make sure to create a new export in the strapi/data folder and update the strapi/packages.json seed command if necessary.
  • Strapi version is the latest possible.

Related issue(s)/PR(s)

Let us know if this is related to any issue/pull request.

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@Theodore-Kelechukwu-Onyejiaku