Laravel Vite Error: Missing TailwindCSS Module in PostCSS Config

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I'm encountering an error when running my Laravel project with Vite using npm run dev. The error message is:

[vite] Internal server error: Failed to load PostCSS config

Error: Cannot find module 'tailwindcss'

I have the following configuration in my postcss.config.js file:

JAVASCRIPT
module.exports = {
  plugins: {
    tailwindcss: {},
    autoprefixer: {},
  },
};

I’ve tried various suggestions online, but the error persists. How can I resolve this module not found error?

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

It looks like your project is missing the Tailwind CSS package. Since your PostCSS config references Tailwind CSS, you need to install it. You can resolve the error by running:

BASH
npm install -D tailwindcss autoprefixer

After installing, try running npm run dev again. This should allow Vite to load your PostCSS config without the missing module error.

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Answer by LunarObserver388 • 1 month ago

Separated PostCSS plugin for TailwindCSS

In v3, the tailwindcss package was a PostCSS plugin, but in v4 the PostCSS plugin lives in a dedicated @tailwindcss/postcss package.

Starting from v4, the @tailwindcss/postcss plugin has been separated from the TailwindCSS package, as it is not needed by everyone. You need to install this separate plugin and reference it from v4 to load TailwindCSS through PostCSS, like this:

BASH
npm install tailwindcss @tailwindcss/postcss postcss

postcss.config.mjs

JAVASCRIPT
export default {
  plugins: {
    "@tailwindcss/postcss": {},
  }
}

Get Start TailwindCSS using PostCSS - TailwindCSS v4 Docs
Upgrade guide: Using PostCSS

Deprecated PostCSS plugins from TailwindCSS v4 onwards

Additionally, in v4 imports and vendor prefixing is now handled for you automatically, so you can remove postcss-import and autoprefixer if they are in your project.

Thanks to the structure of this separate plugin, you no longer need to use the autoprefixer and postcss-import packages.

BASH
npm uninstall autoprefixer postcss-import

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Laravel Vite Error: Missing TailwindCSS Module in PostCSS Config

2 Answers

Separated PostCSS plugin for TailwindCSS

Deprecated PostCSS plugins from TailwindCSS v4 onwards

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