Next font sever/client mismatch in app dir

Hi trying to include a style tag which sets css vars based on next font but get the following error

Text content did not match. Server: ":root {
    --font-p: &#x27;__Montserrat_656221&#x27;, &#x27;__Montserrat_Fallback_656221&#x27;;
}" Client: ":root {
    --font-p: '__Montserrat_656221', '__Montserrat_Fallback_656221';
}"
    at style
    at body
    at html
    at RedirectErrorBoundary 
    ...
    at Router (webpack-internal:///(app-client)/./node_modules/next/dist/client/components/app-router.js:90:11)
    at ErrorBoundaryHandler (webpack-internal:///(app-client)/./node_modules/next/dist/client/components/error-boundary.js:62:9)
    at ErrorBoundary (webpack-internal:///(app-client)/./node_modules/next/dist/client/components/error-boundary.js:87:11)
    at AppRouter (webpack-internal:///(app-client)/./node_modules/next/dist/client/components/app-router.js:372:13)
    at ServerRoot (webpack-internal:///(app-client)/./node_modules/next/dist/client/app-index.js:154:11)
    at RSCComponent
    at Root (webpack-internal:///(app-client)/./node_modules/next/dist/client/app-index.js:171:11)

Text content did not match. Server: ":root {
    --font-p: &#x27;__Montserrat_656221&#x27;, &#x27;__Montserrat_Fallback_656221&#x27;;
}" Client: ":root {
    --font-p: '__Montserrat_656221', '__Montserrat_Fallback_656221';
}"
    at style
    at body
    at html
    at RedirectErrorBoundary 
    ...
    at Router (webpack-internal:///(app-client)/./node_modules/next/dist/client/components/app-router.js:90:11)
    at ErrorBoundaryHandler (webpack-internal:///(app-client)/./node_modules/next/dist/client/components/error-boundary.js:62:9)
    at ErrorBoundary (webpack-internal:///(app-client)/./node_modules/next/dist/client/components/error-boundary.js:87:11)
    at AppRouter (webpack-internal:///(app-client)/./node_modules/next/dist/client/components/app-router.js:372:13)
    at ServerRoot (webpack-internal:///(app-client)/./node_modules/next/dist/client/app-index.js:154:11)
    at RSCComponent
    at Root (webpack-internal:///(app-client)/./node_modules/next/dist/client/app-index.js:171:11)

seems likes next font is adding ' on the server, tried logging it but didn't appear in logs ty for any help here is the layout.tsx (root layout)

import { Montserrat } from 'next/font/google'

const font_p = Montserrat({
    subsets: ['latin'],
    variable: '--font-p',
})

const var_styles = `:root {
    --font-p: ${font_p.style.fontFamily};
}`

export default async function RootLayout({ children }: {children: React.ReactNode,}) {

    return <html lang="en">

        <body className={`${font_p.variable}`}>

            <style>{var_styles}</style>
            
            {children}
        </body>

    </html>
}

import { Montserrat } from 'next/font/google'

const font_p = Montserrat({
    subsets: ['latin'],
    variable: '--font-p',
})

const var_styles = `:root {
    --font-p: ${font_p.style.fontFamily};
}`

export default async function RootLayout({ children }: {children: React.ReactNode,}) {

    return <html lang="en">

        <body className={`${font_p.variable}`}>

            <style>{var_styles}</style>
            
            {children}
        </body>

    </html>
}

Solution:

It looks like it’s encoding the '. What happens if you dangerously set html for var styles

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6 Replies

Solution

sathuros•14mo ago

It looks like it’s encoding the '. What happens if you dangerously set html for var styles

sathuros•14mo ago

That said, I don’t think you need to use the style tag. It should be applying it automatically

ja_iy•14mo ago

ty the encoding was the issue : D I'm using tailwind & my tailwind config references the css var, so when the app loads it briefly flashes the font as the var is undefined, so have to set it in the html wrote this to fix the error

const filter_chars = (str:string) => str.replace(/['|,]/g, "");

export function RootCssVars({vars}:{vars:[name:string, value:string][]}) {

    const var_style = vars
        .map(([name, value]) => `--${name}: ${filter_chars(value)};`)
        .join('\n')

    return <style>{`
        :root {
            ${var_style}
        }
    `}</style>
}

const filter_chars = (str:string) => str.replace(/['|,]/g, "");

export function RootCssVars({vars}:{vars:[name:string, value:string][]}) {

    const var_style = vars
        .map(([name, value]) => `--${name}: ${filter_chars(value)};`)
        .join('\n')

    return <style>{`
        :root {
            ${var_style}
        }
    `}</style>
}

thanks again OwO

ja_iy•14mo ago

never mind <body className={${font_p.variable}}> is performing the same functionality I'm implementing by setting the css var it seems, but the flashing of the font still remains T~T

sathuros•14mo ago

This shouldn’t happen. Check this doc https://nextjs.org/docs/app/building-your-application/optimizing/fonts#with-tailwind-css

Optimizing: Fonts

Optimize your application's web fonts with the built-in next/font loaders.

ja_iy•14mo ago

ty that's how I have it setup except for the className on the body, after switching it to the html the brief flash was even shorter : D was also reading this https://www.lydiahallie.io/blog/optimizing-webfonts-in-nextjs-13 and it seems that a brief flash is inevitable as long as the page loads before the font does, which is probably the case if I'm building and running locally, & reloading the page without the cache

Optimizing Web Fonts in Next.js 13

Learn more about optimizing web fonts and the @next/font module in Next.js 13.

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Next font sever/client mismatch in app dir