ESLint
ESLint is a free, open-source JavaScript linting utility that statically analyzes code to find problems, and can automatically fix many of them with syntax-a…
What ESLint is
ESLint is a free, open-source JavaScript linting utility that statically analyzes code to find problems, and can automatically fix many of them with syntax-aware changes. It can be used through a command-line interface or Node.js API. Rules are pluggable, with additional rules and formatters loadable at runtime; users can also preprocess code, choose custom parsers, and create rules of their own. Plugins extend its reach to JavaScript extensions, TypeScript, React, Angular, Markdown, and other languages or frameworks. Documented integrations cover editors including Visual Studio Code, JetBrains IDEs, Vim, Neovim, Emacs, and Sublime Text, as well as build and CI tools such as Grunt, Webpack, Rollup, Git hooks, and Mega-Linter. ESLint requires Node.js ^20.19.0, ^22.13.0, or >=24 with SSL and ICU support. Created in 2013, it is part of the OpenJS Foundation. The free plan is listed as free.
Good
- Many findings have syntax-aware automatic fixes.
- Rules, parsers, and formatters can be customized.
- Offers both CLI and Node.js API access.
- Documented editor, build, and CI integrations.
Watch out
- Requires a supported Node.js version with SSL and ICU.
- Listed language support count is one.
Who it suits
ESLint suits JavaScript developers who want configurable code checks in an editor, command line, or build workflow. It may also fit teams using supported plugins for TypeScript, React, Angular, Markdown, and other ecosystems.
Verdict
ESLint combines static JavaScript analysis with configurable rules and automatic fixes. Check its Node.js requirement and plugin ecosystem against your development setup.
Plans and prices
From ESLint's own pricing page, checked 30 Sep 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Open source ESLint | Free | JavaScript linting · npm installation · extensible rules and plugins |
The facts
Each one read from ESLint's own pages, with the date it was checked.
What it does
- Automatic fixes
- Many problems ESLint finds can be automatically fixed with syntax-aware fixes.checked 30 Sep 2026
- Build and CI integrations
- Documented integrations include Grunt, Webpack, Rollup, Git hooks, and CI-oriented tools such as Mega-Linter.checked 30 Sep 2026
- Command line and API
- ESLint provides a command-line interface and a Node.js API for programmatic linting.checked 30 Sep 2026
- Commercial support
- Commercial support is available through Tidelift for current and maintenance releases and HeroDevs for end-of-life releases.checked 30 Sep 2026
- Customization
- Users can preprocess code, use custom parsers, and write custom rules alongside built-in rules.checked 30 Sep 2026
- Editor integrations
- Official documentation lists integrations for Visual Studio Code, JetBrains IDEs, Vim, Neovim, Emacs, Sublime Text, and other editors.checked 30 Sep 2026
- Governance
- ESLint is part of the OpenJS Foundation, which provides legal infrastructure and owns related intellectual property while not running day-to-day operations.checked 30 Sep 2026
- Language ecosystem
- Plugins can add support for JavaScript extensions, TypeScript, React, Angular, Markdown, and other languages or frameworks.checked 30 Sep 2026
- Node.js requirement
- ESLint requires Node.js ^20.19.0, ^22.13.0, or >=24 with SSL and ICU support.checked 30 Sep 2026
- Open source
- ESLint is an open source JavaScript linting utility originally created by Nicholas C. Zakas in June 2013.checked 30 Sep 2026
- Pluggability
- Every ESLint rule is pluggable, and additional rules and formatters can be loaded at runtime.checked 30 Sep 2026
- Purpose
- ESLint statically analyzes JavaScript code to find and fix problems.checked 30 Sep 2026
- Security reporting
- Security vulnerabilities should be reported through GitHub's create-an-advisory form.checked 30 Sep 2026
- Version support
- The ESLint team supports the current major version continuously and the previous version with limited support for six months.checked 30 Sep 2026
The company
- Founded
- 2013checked 28 Sep 2026
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