markdownlint
A Visual Studio Code extension for linting and style checking Markdown files with a comprehensive rule set.
What is markdownlint?
markdownlint is a Visual Studio Code extension that performs linting and style checking for Markdown files. It identifies violations of a comprehensive set of rules to ensure consistency, avoid problematic constructs, and improve the overall quality of Markdown documentation. The extension provides real-time feedback directly in the editor and can automatically fix many common issues.
Developers, technical writers, and documentation maintainers who write Markdown in Visual Studio Code and want to enforce consistent style and avoid errors.
Developers choose markdownlint for its deep integration with VS Code, extensive and configurable rule set, and ability to automatically fix violations. It helps teams maintain high-quality, consistent documentation with minimal effort.
Overview
Markdown linting and style checking for Visual Studio Code
Use Cases
Best For
- Enforcing consistent Markdown style across team documentation
- Identifying and fixing common Markdown syntax errors during writing
- Automatically formatting Markdown files to meet project standards
- Linting entire documentation repositories from within VS Code
- Extending Markdown validation with custom, project-specific rules
- Improving Markdown portability by avoiding parser-specific constructs
Not Ideal For
- Teams using IDEs other than Visual Studio Code for Markdown editing
- Projects with highly permissive or no Markdown style guidelines
- Workflows that require linting only in command-line or CI environments without VS Code integration
- Users who find real-time inline warnings distracting or prefer a minimalist editing experience
Pros & Cons
Pros
Includes over 50 configurable rules covering headings, lists, links, code blocks, and more, as detailed in the README's comprehensive list, ensuring thorough style checking.
Provides immediate inline warnings with wavy green underlines as you type, allowing for instant correction of violations without leaving the editor.
Many rule violations, such as MD009 for trailing spaces, can be automatically corrected via quick fixes or document formatting commands, with a specific list of fixable rules provided.
Supports multiple configuration methods including JSON, YAML, JS files, VS Code settings, and inline comments, with clear precedence rules explained in the Configure section.
Allows extending linting with user-defined JavaScript rules, enabling project-specific validations as described in the customRules configuration.
Cons
Tightly integrated with Visual Studio Code, making it incompatible with other editors and limiting its use in diverse or multi-editor development environments.
Multiple configuration sources and precedence rules can lead to confusion and unintended behavior, as highlighted in the Configure section with various file types and settings.
Running JavaScript from custom rules or config files poses security concerns, requiring careful management of VS Code's Workspace Trust settings, which adds overhead.
Real-time linting across all Markdown files in a workspace, enabled by default, might impact editor performance in large projects, though not explicitly stated, it's a potential trade-off.
Frequently Asked Questions
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