# vscode-css-languageservice > Language service for CSS, LESS and SCSS Latest version **6.3.10** (published 2026-02-23) · MIT license · 0 weekly downloads ## Install ```sh npm install vscode-css-languageservice pnpm add vscode-css-languageservice yarn add vscode-css-languageservice bun add vscode-css-languageservice ``` ## Health **Score 65/100 (B)** — status: stable. Positive: has types; esm support; no vulnerabilities; high maintenance score; high quality score. Warnings: low downloads. ## Facts | | | |---|---| | Version | 6.3.10 | | Published | 2026-02-23 | | First published | 2016-06-23 | | Weekly downloads | 0 | | License | MIT | | TypeScript types | bundled | | Module format | ESM + CommonJS | | Dependencies | 4 | | Unpacked size | 4.5 MB | | Known vulnerabilities | 0 | | Install scripts | no | | GitHub stars | 385 | | Author | Microsoft Corporation | | Maintainers | microsoft1es, microsoft-oss-releases, alexandrudima, joaomoreno.ms, kaimaetzel, sbatten, lszomoru, vscode-bot | ## Links - npm: https://www.npmjs.com/package/vscode-css-languageservice - Repository: https://github.com/Microsoft/vscode-css-languageservice - Homepage: https://github.com/Microsoft/vscode-css-languageservice#readme - Issues: https://github.com/Microsoft/vscode-css-languageservice - npm.io page: https://npm.io/package/vscode-css-languageservice ## Dependencies (4) - [vscode-uri](https://npm.io/package/vscode-uri.md) ^3.1.0 - [@vscode/l10n](https://npm.io/package/@vscode/l10n.md) ^0.0.18 - [vscode-languageserver-types](https://npm.io/package/vscode-languageserver-types.md) 3.17.5 - [vscode-languageserver-textdocument](https://npm.io/package/vscode-languageserver-textdocument.md) ^1.0.12 ## Recent versions - 6.3.10 (latest) — 2026-02-23 - 7.0.0-next.2 (next) — 2026-09-08 - 7.0.0-next.1 — 2026-03-04 - 6.3.9 — 2025-12-01 - 6.3.8 — 2025-09-29 - 6.3.7 — 2025-06-30 - 6.3.6 — 2025-06-02 - 6.3.6-next.0 — 2025-04-25 - 6.3.5 — 2025-04-25 - 6.3.4 — 2025-04-03 - 6.3.4-next.0 — 2025-03-24 - 6.3.3 — 2025-03-24 - 6.3.3-3 — 2025-03-24 - 6.3.3-2 — 2025-03-13 - 6.3.3-1 — 2025-02-18 - … 187 more at https://npm.io/package/vscode-css-languageservice/versions ## README # vscode-css-languageservice Language services for CSS, LESS and SCSS [![npm Package](https://img.shields.io/npm/v/vscode-css-languageservice.svg?style=flat-square)](https://www.npmjs.org/package/vscode-css-languageservice) [![NPM Downloads](https://img.shields.io/npm/dm/vscode-css-languageservice.svg)](https://npmjs.org/package/vscode-css-languageservice) [![Build Status](https://github.com/microsoft/vscode-css-languageservice/actions/workflows/node.js.yml/badge.svg)](https://github.com/microsoft/vscode-css-languageservice/actions) [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) Why? ---- The _vscode-css-languageservice_ contains the language smarts behind the CSS, LESS and SCSS editing experience of Visual Studio Code and the Monaco editor. - *doValidation* analyses an input string and returns syntax and lint errors. - *doComplete* provides completion proposals for a given location. - *doHover* provides a hover text for a given location. - *findDefinition* finds the definition of the symbol at the given location. - *findReferences* finds all references to the symbol at the given location. - *findDocumentHighlights* finds all symbols connected to the given location. - *findDocumentLinks* provides all symbols in the given document - *findDocumentSymbols* provides all links for references in the given document - *doCodeActions* evaluates code actions for the given location, typically to fix a problem. - *findDocumentColors* evaluates all color symbols in the given document - *getColorPresentations* lists valid CSS color presentations - *doRename* renames all symbols connected to the given location. - *prepareRename* the range of the node that can be renamed - *getFoldingRanges* returns folding ranges in the given document. - *getSelectionRanges* returns selection ranges in the given document. The _vscode-css-languageservice_ does not cover syntax highlighting. VS Code uses TextMate grammars for that, with a grammar that is maintained in https://github.com/microsoft/vscode-css. All CSS entities (properties, at-rules, etc) are sourced from https://github.com/microsoft/vscode-custom-data/tree/master/web-data and transpiled here. For adding new property or fixing existing properties' completion/hover description, please open PR there. Installation ------------ npm install --save vscode-css-languageservice API --- For the complete API see [cssLanguageService.ts](./src/cssLanguageService.ts) and [cssLanguageTypes.ts](./src/cssLanguageTypes.ts) Development ----------- - clone this repo, run `npm install` - `npm test` to compile and run tests How can I run and debug the service? - open the folder in VSCode. - set breakpoints, e.g. in `cssCompletion.ts` - run the Unit tests from the run viewlet and wait until a breakpoint is hit: ![image](https://user-images.githubusercontent.com/6461412/94239202-bdad4e80-ff11-11ea-99c3-cb9dbeb1c0b2.png) How can I run and debug the service inside an instance of VSCode? - run VSCode out of sources setup as described here: https://github.com/Microsoft/vscode/wiki/How-to-Contribute - run `npm link` in the folder of `vscode-css-languageservice` - use `npm link vscode-css-languageservice` in `vscode/extensions/css-language-features/server` to run VSCode with the latest changes from `vscode-css-languageservice` - run VSCode out of source (`vscode/scripts/code.sh|bat`) and open a `.css` file - in VSCode window that is open on the `vscode-css-languageservice` sources, run command `Debug: Attach to Node process` and pick the `code-oss` process with the `css-language-features` path ![image](https://user-images.githubusercontent.com/6461412/94242567-842b1200-ff16-11ea-8f85-3ebb72d06ba8.png) - set breakpoints, e.g. in `cssCompletion.ts` - in the instance run from sources, invoke code completion in the `.css` file License ------- (MIT License) Copyright 2016, 25 Microsoft With the exceptions of `build/mdn-documentation.js`, which is built upon content from [Mozilla Developer Network](https://developer.mozilla.org/docs/Web) and distributed under CC BY-SA 2.5. --- _Source: https://npm.io/package/vscode-css-languageservice · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._