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Monaco CSS

CSS language plugin for the Monaco Editor. It provides the following features when editing CSS, LESS and SCSS files:

  • Code completion
  • Hovers
  • Validation: Syntax errors and linting
  • Find definition, references & highlights for symbols in the same file
  • Document Symbols

Linting an be configured through the API. See here for the API that the CSS plugin offers to configure the CSS/LESS/SCSS language support.

Internally the CSS plugin uses the vscode-css-languageservice node module, providing the implementation of the functionally listed above. The same module is also used in Visual Studio Code to power the CSS, LESS and SCSS editing experience.


Please file issues concering monaco-css in the monaco-editor repository.


This npm module is bundled and distributed in the monaco-editor npm module.


  • git clone
  • cd monaco-css
  • npm install .
  • npm run watch
  • open $/monaco-css/test/index.html in your favorite browser.