Module not found: Can't resolve 'sass-loader' [Solved]

# Module not found: Can't resolve 'sass-loader'

To solve the error "Module not found: Error: Can't resolve 'sass-loader'", make sure to install the package by opening your terminal in your project's root directory and running the command npm install --save-dev sass-loader sass webpack and restart your development server.

Open your terminal in your project's root directory (where your package.json file is located) and run the following commands:

shell

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# 👇️ with NPM
npm install --save-dev sass-loader sass webpack

# 👇️ ONLY If you use TypeScript
npm install --save-dev @types/sass-loader @types/sass @types/webpack

# ----------------------------------------------

# 👇️ with YARN
yarn add sass-loader sass webpack --dev

# 👇️ ONLY If you use TypeScript
yarn add @types/sass-loader @types/sass @types/webpack --dev

The command will add the sass-loader package to the dependencies of your project.

Make sure to restart your development server and your IDE if necessary. Your dev server won't pick up the changes until you stop it and re-run the npm start command.

The installed packages assume that you use Dart Sass.

Now you can import your scss file.

App.js

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import "./style.scss";

The imported file may look something like this:

style.scss

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$body-color: red;

body {
  color: $body-color;
}

And your Webpack config should look something as follows.

webpack.config.js

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module.exports = {
  module: {
    rules: [
      {
        test: /\.s[ac]ss$/i,
        use: [
          // Creates `style` nodes from JS strings
          "style-loader",
          // Translates CSS into CommonJS
          "css-loader",
          // Compiles Sass to CSS
          "sass-loader",
        ],
      },
    ],
  },
};

If you haven't installed the style-loader and css-loader packages, make sure to do so.

shell

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# 👇️ with NPM
npm install --save-dev style-loader css-loader

# ----------------------------------------------

# 👇️ with YARN
yarn add style-loader css-loader --dev

And restart your development server.

For custom config and options, refer to the npm page of the sass-loader package.

# Delete your node_modules and reinstall your dependencies

If the error is not resolved, try to delete your node_modules and package-lock.json (not package.json) files, re-run npm install and restart your IDE.

If you are on macOS or Linux, issue the following commands in bash or zsh.

shell

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#  for macOS and Linux
rm -rf node_modules
rm -f package-lock.json
rm -f yarn.lock

# 👇️ clean your npm cache
npm cache clean --force

# 👇️ install packages
npm install

If you are on Windows, issue the following commands in CMD.

cmd

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# for Windows
rd /s /q "node_modules"
del package-lock.json
del -f yarn.lock

# 👇️ clean your npm cache
npm cache clean --force

# 👇️ install packages
npm install

Make sure to restart your IDE and dev server if the error persists. VS Code often glitches and a reboot solves things sometimes.

# Verify you have `sass-loader` installed

If you still get the error, open your package.json file and make sure it contains the sass-loader package in the devDependencies object.

package.json

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{
  // ... rest
  "devDependencies": {
    "sass-loader": "^12.6.0",
    "@types/sass-loader": "^8.0.3",
    "sass": "^1.49.11",
    "@types/sass": "^1.43.1",
    "webpack": "^5.71.0",
    "@types/webpack": "^5.28.0",
    "css-loader": "^6.7.1",
    "style-loader": "^3.3.1"
  }
}

The sass-loader module should NOT be globally installed or be in your project's dependencies. It should be in the devDependencies object in your package.json file.

You can try to manually add the lines and re-run npm install.

shell

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npm install

Or install the latest version of the packages:

shell

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# 👇️ with NPM
npm install --save-dev sass-loader@latest sass@latest webpack@latest

npm install --save-dev style-loader@latest css-loader@latest

# 👇️ ONLY If you use TypeScript
npm install --save-dev @types/sass-loader@latest @types/sass@latest @types/webpack@latest

# ----------------------------------------------

# 👇️ with YARN
yarn add sass-loader@latest sass@latest webpack@latest --dev

yarn add style-loader@latest css-loader@latest --dev

# 👇️ ONLY If you use TypeScript
yarn add @types/sass-loader@latest @types/sass@latest @types/webpack@latest --dev

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Module not found: Can't resolve 'sass-loader' [Solved]