ESLint
What ESLint is
ESLint is a free, open-source utility that statically analyzes JavaScript code to identify problems and help fix them. Many findings can be corrected automatically using syntax-aware fixes. Developers can run it from the command line or use its Node.js API for programmatic linting. Rules are pluggable, with additional rules and formatters loadable at runtime; users can also preprocess code, select custom parsers, and write custom rules. Documented editor integrations include Visual Studio Code, JetBrains IDEs, Vim, Neovim, Emacs, and Sublime Text. Build and workflow integrations include Grunt, Webpack, Rollup, Git hooks, and CI-oriented tools such as Mega-Linter. Plugins can extend support to JavaScript extensions, TypeScript, React, Angular, Markdown, and other languages or frameworks. ESLint requires Node.js ^20.19.0, ^22.13.0, or >=24 with SSL and ICU support. The project began in June 2013 and is part of the OpenJS Foundation, which provides legal infrastructure and owns related intellectual property but does not direct day-to-day operations.
Who it suits
ESLint suits JavaScript developers who want configurable static analysis in editors, command-line workflows, builds, or CI. It can also suit teams that need custom rules or plugins for related languages and frameworks.
What it does well
- Free, open-source JavaScript linting utility.
- Many problems can be fixed automatically.
- Rules, parsers, and formatters are customizable.
- Documented integrations cover editors, build tools, and CI.
- Node.js API enables programmatic linting.
What to know first
- Requires Node.js ^20.19.0, ^22.13.0, or >=24.
- Node.js must include SSL and ICU support.
- Current major version receives continuous support; previous support is limited to six months.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Open source ESLint | JavaScript linting · npm installation · extensible rules and plugins | Free |
As eslint.org lists them, read 30 Sept 2026. The maker's own page has the final word.
Verdict
ESLint offers configurable JavaScript analysis with automatic fixes and broad documented integrations. Confirm the Node.js requirement and version-support window fit your environment.
Facts from ESLint's own pages
- Automatic fixes
- Many problems ESLint finds can be automatically fixed with syntax-aware fixes. · eslint.org, 30 Sept 2026
- Build and CI integrations
- Documented integrations include Grunt, Webpack, Rollup, Git hooks, and CI-oriented tools such as Mega-Linter. · eslint.org, 30 Sept 2026
- Command line and API
- ESLint provides a command-line interface and a Node.js API for programmatic linting. · eslint.org, 30 Sept 2026
- Commercial support
- Commercial support is available through Tidelift for current and maintenance releases and HeroDevs for end-of-life releases. · eslint.org, 30 Sept 2026
- Customization
- Users can preprocess code, use custom parsers, and write custom rules alongside built-in rules. · eslint.org, 30 Sept 2026
- Editor integrations
- Official documentation lists integrations for Visual Studio Code, JetBrains IDEs, Vim, Neovim, Emacs, Sublime Text, and other editors. · eslint.org, 30 Sept 2026
- Founded
- 2013 · eslint.org, 28 Sept 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. · eslint.org, 30 Sept 2026
- Language ecosystem
- Plugins can add support for JavaScript extensions, TypeScript, React, Angular, Markdown, and other languages or frameworks. · eslint.org, 30 Sept 2026
- Node.js requirement
- ESLint requires Node.js ^20.19.0, ^22.13.0, or >=24 with SSL and ICU support. · eslint.org, 30 Sept 2026
- Open source
- ESLint is an open source JavaScript linting utility originally created by Nicholas C. Zakas in June 2013. · eslint.org, 30 Sept 2026
- Pluggability
- Every ESLint rule is pluggable, and additional rules and formatters can be loaded at runtime. · eslint.org, 30 Sept 2026
- Purpose
- ESLint statically analyzes JavaScript code to find and fix problems. · eslint.org, 30 Sept 2026
- Security reporting
- Security vulnerabilities should be reported through GitHub's create-an-advisory form. · eslint.org, 30 Sept 2026
- Version support
- The ESLint team supports the current major version continuously and the previous version with limited support for six months. · eslint.org, 30 Sept 2026
Where ESLint stands on Freedom251
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