less
Leaner CSS
Last updated a year ago
by matthew-dean
.
Apache-2.0
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Repository
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Original npm
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package.json
$ cnpm install less
SYNC missed versions from
official npm registry.
Less.js
The dynamic stylesheet language. lesscss.org
Less extends CSS with variables, mixins, functions, nesting, and more — then compiles to standard CSS. Write cleaner stylesheets with less code.
@primary: #4a90d9;
.button {
color: @primary;
&:hover {
color: darken(@primary, 10%);
}
}
Install
npm install less
Usage
Node.js
import less from 'less';
const output = await less.render('.class { width: (1 + 1) }');
console.log(output.css);
Command Line
npx lessc styles.less styles.css
Browser
<link rel="stylesheet/less" type="text/css" href="styles.less" />
<script src="https://cdn.jsdelivr.net/npm/less"></script>
Why Less?
- Variables — define reusable values once
- Mixins — reuse groups of declarations across rulesets
- Nesting — mirror HTML structure in your stylesheets
- Functions — transform colors, manipulate strings, do math
- Imports — split stylesheets into manageable pieces
- Extend — reduce output size by combining selectors
Documentation
Full documentation, usage guides, and configuration options at lesscss.org.
Contributing
Less.js is open source. Report bugs, submit pull requests, or help improve the documentation.
See CONTRIBUTING.md for development setup.
License
Copyright (c) 2009-2025 Alexis Sellier & The Core Less Team Licensed under the Apache License.
Current Tags
- 3.13.0-alpha.3 ... alpha (5 years ago)
- 4.6.3-beta.0 ... beta (a month ago)
- 3.13.1-next.1 ... canary (5 years ago)
- 4.6.4 ... latest (a month ago)
143 Versions
- 4.6.4 ... a month ago
- 4.6.3 ... a month ago
- 4.6.3-beta.0 ... a month ago
- 4.6.2 ... a month ago
- 4.6.1 ... a month ago
- 4.6.0 ... a month ago
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- 4.1.3 ... 4 years ago
- 4.1.2 ... 5 years ago
- 4.1.1 ... 5 years ago
- 4.1.0 ... 5 years ago
- 4.0.0 ... 5 years ago
- 3.13.1 ... 5 years ago
- 3.13.0-alpha.3 ... 5 years ago
- 3.13.0-alpha.2 ... 5 years ago
- 3.13.1-next.1 ... 5 years ago
- 3.13.0 ... 5 years ago
- 3.13.0-alpha.12 ... 5 years ago
- 3.12.1-alpha.12 ... 5 years ago
- 3.13.0-alpha.10 ... 5 years ago
- 4.0.1-alpha.2 ... 5 years ago
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- 3.12.1-alpha.13 ... 5 years ago
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- 3.10.0 [deprecated] ... 7 years ago
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- 1.5.0-b4 ... 13 years ago
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- 1.0.32 ... 15 years ago
- 1.0.36 ... 15 years ago
- 1.0.14 ... 15 years ago
Maintainers (5)
cloudhead
lukeapage
matthew-dean
meri
seven-phases-max
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Dependencies (10)
- copy-anything ^2.0.1
- parse-node-version ^1.0.1
- tslib ^2.3.0
- errno ^0.1.1
- graceful-fs ^4.1.2
- image-size ~0.5.0
- make-dir ^2.1.0
- mime ^1.4.1
- needle ^3.1.0
- source-map ~0.6.0
Dev Dependencies (47)
- @less/test-data ^4.2.2
- @less/test-import-module ^4.0.0
- @rollup/plugin-commonjs ^17.0.0
- @rollup/plugin-json ^4.1.0
- @rollup/plugin-node-resolve ^11.0.0
- @typescript-eslint/eslint-plugin ^4.28.0
- @typescript-eslint/parser ^4.28.0
- benny ^3.6.12
- bootstrap-less-port 0.3.0
- chai ^4.2.0
- cross-env ^7.0.3
- diff ^3.2.0
- eslint ^7.29.0
- fs-extra ^8.1.0
- git-rev ^0.2.1
- globby ^10.0.1
- grunt ^1.0.4
- grunt-cli ^1.3.2
- grunt-contrib-clean ^1.0.0
- grunt-contrib-connect ^1.0.2
- grunt-eslint ^23.0.0
- grunt-saucelabs ^9.0.1
- grunt-shell ^1.3.0
- html-template-tag ^3.2.0
- jit-grunt ^0.10.0
- less-plugin-autoprefix ^1.5.1
- less-plugin-clean-css ^1.6.0
- minimist ^1.2.0
- mocha ^6.2.1
- playwright ^1.49.0
- mocha-teamcity-reporter ^3.0.0
- nock ^11.8.2
- npm-run-all ^4.1.5
- performance-now ^0.2.0
- phin ^2.2.3
- promise ^7.1.1
- read-glob ^3.0.0
- resolve ^1.17.0
- rollup ^2.52.2
- rollup-plugin-terser ^5.1.1
- rollup-plugin-typescript2 ^0.29.0
- semver ^6.3.0
- shx ^0.3.2
- time-grunt ^1.3.0
- ts-node ^10.9.1
- typescript ^4.3.4
- uikit 2.27.4
Dependents (49)
- @angular-devkit/build-angular
- @angular-devkit/build-webpack
- @angular/build
- @hap-toolkit/dsl-xvm
- @parcel/transformer-less
- @rspack/plugin-less
- @tarojs/mini-runner
- @tarojs/webpack-runner
- @tarojs/webpack5-runner
- @umijs/bundler-esbuild
- @umijs/bundler-utoopack
- @umijs/bundler-vite
- @umijs/bundler-webpack
- @umijs/mako
- @utoo/pack
- @vant/cli
- @vue/component-compiler
- af-webpack
- asset-rack
- browserify-server
- docz-plugin-css-temp
- docz-plugin-umi-css
- easywebpack
- egg-webpack-vue
- father
- father-build
- font-awesome
- gatsby
- gear-lib
- grunt-contrib
- grunt-contrib-less
- gulp-jsx2example
- gulp-less
- less-loader
- less-middleware
- less-plugin-aliases
- lessc
- loader
- miniprogram-ci
- miniprogram-simulate
- mochawesome
- next
- package-build-stats
- rc-tools
- rigging
- rollup-plugin-vue
- sails
- tdesign-vue-next
- umi-library