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markdownlint

Free#11 of 33 in Linters

Node.js style checker and lint tool for Markdown/CommonMark files.

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Visit markdownlint

At a glance

• Editor score
  Not yet scored
• Pricing
  Free plan
• Best for
  Markdown documentation teams
• Free plan
  Yes
• Paid from
  None
• CI support
  Yes
• Facts checked
  21 Sep 2026

• Where it wins

  • Built-in rules cover Markdown style and consistency issues
  • Supports custom rules, configurable severity, and automatic fixes
  • Works across editors, CI, Docker, pre-commit, browser, and APIs

• Where it doesn't

  • Focused on one language rather than broad multi-language linting
  • Does not provide security rules
  • Some integrations rely on companion projects in its ecosystem

Our verdict on markdownlint

markdownlint is an open-source Node.js library for checking Markdown and CommonMark files for style and consistency issues. It suits documentation teams and developers who want repeatable standards for headings, whitespace, links, lists, tables, emphasis, code blocks, and other Markdown constructs. Support for GitHub Flavored Markdown, front matter recognition and exclusion, inline rule suppression, and automatic fixes makes it applicable to both standalone documentation and repository-based content workflows. It also supports linting files or strings through asynchronous, synchronous, and Promise-based APIs, with a browser build for in-browser linting.

The published project model is open source and includes a free plan, making markdownlint a practical fit for teams that want to define standards without adopting a paid tier structure. Configuration covers rule enablement, severity, and parameters, while custom rules can be loaded from packages or defined locally. That combination gives teams control over how strictly content is checked and how project-specific conventions are expressed. Automatic fixes are available for rules that provide fix information, which can reduce manual cleanup for supported issues without making every rule fully corrective.

Its ecosystem fit is a central strength. The wider project ecosystem includes a command-line interface, Visual Studio Code support, a GitHub Action, Docker, and pre-commit integration, alongside the core library and browser and API options. The documented integrations make it suitable for editor checks, continuous integration, and local commit workflows, although some support is provided through companion projects rather than the core package. Teams focused on Markdown quality should find the scope appropriate; organizations seeking security linting or broad multi-language analysis should choose a tool designed for those requirements instead.

markdownlint pricing

markdownlint fact sheet

markdownlint integrations

markdownlint lists 6 integrations on its own site.

• markdownlint-cli
• markdownlint-cli2
• markdownlint-cli2-action
• vscode-markdownlint
• GitHub Super-Linter
• markdownlint-cli problem matcher

Alternatives to markdownlint

• ESLintA free, extensible JavaScript linter with autofix, plugins, and broad developer-tool integrations.—
• RuffFree Python linting and formatting with more than 900 built-in rules.—
• ShellCheckA free, open-source linter for shell syntax, portability, robustness and security checks.—

See all markdownlint alternatives →

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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used markdownlint for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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