The initial UI did not match the server-rendered content, resulting in a Next.JS Hydration failure

I'm facing an issue with hydration in Next.JS 14, where there is a discrepancy between the server-side rendered UI and the client-side rendering. I have a suspicion that this problem may stem from using new Date(), which could be producing different values on the server and client. How can I tackle this challenge while ensuring it remains integrated into my layout page?

import type { Metadata } from "next";
import { Inter } from "next/font/google";
import "./globals.css";

export default function RootLayout({
  children,
}: {
  children: React.ReactNode;
}) {
  return (
    <html lang="en">
      <body className={inter.className}>{children}</body>
      <footer>
        <p>Page Rendered on - </p>
        {new Date().toLocaleDateString()}
      </footer>
    </html>
  );
}

Answer №1

Big shoutout to @Naveen Nizam for the helpful tips provided in the comments.

The root cause was my departure from Next.js's current template standards. Instead of using a div tag as the main container, I erroneously used a span tag, a practice carried over from previous versions of Next.js.

The issue was resolved by updating the code as follows:

return (
  <div lang="en">
    ...
  </div>
);

Answer №2

It appears that there could be various reasons behind this error. While my scenario differs slightly from yours, sharing my experience might benefit others encountering the same issue in the future.

Upon investigation, I discovered that the <link> tags in my layout.js were the root cause of the problem due to using a deprecated method.

Original Code:

import { Inter } from "next/font/google";

export default function RootLayout({ children }) {
  return (
    <html lang="en">

      <link rel="stylesheet" type="text/css" charset="UTF-8" href="[https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.min.css](https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.min.css)" />
      <link rel="stylesheet" type="text/css" href="[https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick-theme.min.css](https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick-theme.min.css)" />
      
      <body className={inter.className}>

        <Appy>
          <RootOfAllClientSide>
            {children}
          </RootOfAllClientSide>
        </Appy>

      </body>
      
    </html>
  );
}


Updated Version:

import { Inter } from "next/font/google";

import "slick-carousel/slick/slick.css";
import "slick-carousel/slick/slick-theme.css";

export default function RootLayout({ children }) {
  return (
    <html lang="en">

      <body className={inter.className}>

        <Appy>
          <RootOfAllClientSide>
            {children}
          </RootOfAllClientSide>
        </Appy>

      </body>

      
    </html>
  );
}

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