Hydration Error Across All Pages in Next.js 15.0.1
Answered
Sammy Kunimatsu posted this in #help-forum
I'm encountering a hydration error on every page of my site using Next.js version 15.0.1. The error message states:
I’ve attached a screenshot of the full error message (both in the console and call stack).
Here's what happens:
1. The error appears every time I load a page.
2. When I make changes to the code on the page I'm currently viewing, the error disappears temporarily.
3. However, if I refresh the page, the error comes back consistently.
Does anyone have any suggestions on how to troubleshoot or resolve this?
Thank you in advance for your help!
"Hydration failed because the server rendered HTML didn't match the client. As a result this tree will be regenerated on the client. This can happen if a SSR-ed Client Component used"
I’ve attached a screenshot of the full error message (both in the console and call stack).
Here's what happens:
1. The error appears every time I load a page.
2. When I make changes to the code on the page I'm currently viewing, the error disappears temporarily.
3. However, if I refresh the page, the error comes back consistently.
Does anyone have any suggestions on how to troubleshoot or resolve this?
Thank you in advance for your help!
Answered by Jboncz
I dont know the precise cause but every one of your layouts in every route is RootLayout (which is bad use... only have one root layout the rest are just Layout) and your importing <html> and <body> in every single layout
43 Replies
Still not solved?
no
Can you share your codebase?
@Sammy Kunimatsu , can you try in incognito mode?
Are you using next-themes?
Okay, I have found the issue.
I dont know the precise cause but every one of your layouts in every route is RootLayout (which is bad use... only have one root layout the rest are just Layout) and your importing <html> and <body> in every single layout
Answer
and your re-importing your css in every layout, layout is a waterfall. it goes down, so your true root layout everything in there applied to all routes under it.
Heres an example layout that would fix your issue in the login route
but seeing as your not doing anything here, you really dont need a layout.
import type { Metadata } from "next";
export const metadata: Metadata = {
title: "Login",
description: "Generated by create next app",
};
export default function Layout({
children,
}: Readonly<{
children: React.ReactNode;
}>) {
return (
<>
{children}
</>
);
}but seeing as your not doing anything here, you really dont need a layout.
@Sammy Kunimatsu
Thank you for the help so far, but now it seems like the error has changed. I applied the adjustments you suggested across all my Layouts except for the RootLayout. Specifically, I did the following:
- I renamed all the layout files to "Layout" except for the RootLayout.
- I removed the
- I also removed the CSS and font imports from those Layouts, leaving them only in the RootLayout.
However, now I'm getting the following error (see attached screenshot). Any ideas on what might be causing this?
- I renamed all the layout files to "Layout" except for the RootLayout.
- I removed the
<body> and <html> tags from the other Layouts.- I also removed the CSS and font imports from those Layouts, leaving them only in the RootLayout.
However, now I'm getting the following error (see attached screenshot). Any ideas on what might be causing this?
What page are you getting that on?
or can you zip up the new project?
With changes?
I didnt make changes across the codebase, only determined the issue and closed it 😅
On all pages, because of metaData
on moment. let me init it
ok
Im not getting those errors at all.
Can you give me the exact page you were on when you saw that error?
@Sammy Kunimatsu
all pages...
Gotcha, im not seeing it at all. Can you delete your .next folder and start the server abck up?
it was the same
It has to be something on your system, potentially a browser extension, its the only reason you would get it an not me. I dusted off my mac and even loaded it there just to see if id have the same issue. ( I didnt know what OS you were using at the time 🙂 )
Try it in edge. just humor me (assuming edge is 'vanilla')
thank you very much, that was indeed the issue it turned out to be caused by browser extensions. If it's just an extension problem, I don't need to worry too much about it, right?
were these 4 extensions
Yeah its just going to be really really annoying to develop. You wont see these errors in production, but they could be indicative of other issues, I would use incognito or a seperate browser for all your testing.
if I had to pick one, its probably foxified.
but I cant be sure.
hydration errors shouldnt be totally ignored when doing development, always better to develop in a sterile environment when you can, sooooo use edge with no browsers or some other chromium based browser or a portable version of chrome that you can run while doing testing if you prefer that.
Ok! Thank you very much, it helped me a lot!
No worries man good luck!