Markdown Linter

Check Markdown for style issues: heading levels, code fences, list consistency, and more (zero-dependency rule engine)

Key Facts

Category
Developer & Web
Input Types
textarea, select
Output Type
text
Sample Coverage
4
API Ready
Yes

Overview

The Markdown Linter is a zero-dependency rule engine designed to analyze your Markdown text for style issues, including inconsistent heading levels, unclosed code fences, and irregular list formatting.

When to Use

  • •Before committing documentation to a repository to ensure consistent styling.
  • •When troubleshooting broken rendering in Markdown parsers caused by malformed list structures or heading levels.
  • •To standardize formatting across multi-author technical blogs or documentation sites.

How It Works

  • •Paste your Markdown content into the input text area.
  • •Select your preferred rule set (Standard, Relaxed, or Strict) and choose the output report format (Text or JSON).
  • •Run the linter to view the validation report highlighting style issues.

Use Cases

Validating technical documentation files before publishing to a static site generator.
Auditing README files in open-source repositories for consistent heading hierarchies.
Checking automated Markdown reports generated by scripts for formatting errors.

Examples

1. Fixing Heading Hierarchies in API Docs

Technical Writer
Background
A technical writer is preparing API documentation but notices that some sections render incorrectly on the documentation portal.
Problem
The document contains skipped heading levels (e.g., H3 directly under H1) and inconsistent list markers.
How to Use
Paste the API documentation Markdown into the input, select the 'Strict' rule set, set the report format to 'Text Report', and run the linter.
Example Config
Rule Set: Strict, Report Format: Text
Outcome
The linter identifies the exact line numbers where heading levels skip and where list markers mismatch, allowing quick manual corrections.

2. Automating Readme Audits

DevOps Engineer
Background
A DevOps engineer wants to parse linting results programmatically to block commits with poorly formatted README files.
Problem
Manual reviews of README files are slow and prone to missing unclosed code blocks.
How to Use
Paste the README content, select the 'Standard' rule set, and set the report format to 'JSON'.
Example Config
Rule Set: Standard, Report Format: JSON
Outcome
The tool outputs a structured JSON payload detailing all style violations, which can be easily parsed by automated scripts.

Try with Samples

markdown
Markdown Slide Deck Samples
Remark/Marp style Markdown slide decks for testing PDF export layouts
title token markdown
markdown
Markdown Samples
Markdown format examples from simple to complex document structures
title token markdown
markdown
Markdown Link Extractor Samples
Sample Markdown documents with various link types for testing the Markdown Link Extractor tool
title token markdown
markdown
PDF Samples
Generated PDF samples from tools dated 2026-02-01 to 2026-02-10
preferred input family markdown
markdown

Related Hubs

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FAQ

What rules does the linter check?

It checks heading levels, code fence closures, list consistency, and general Markdown style guidelines.

What is the difference between the Standard, Relaxed, and Strict rule sets?

Standard applies common style rules, Relaxed ignores minor formatting deviations, and Strict enforces rigid structural and spacing guidelines.

Can I export the linting report?

Yes, you can generate the report in either plain text or JSON format.

Does this tool modify my Markdown file?

No, it only analyzes the text and reports style issues without altering your original input.

Does the linter support external plugins?

No, it runs on a built-in, zero-dependency rule engine.

API Documentation

Request Endpoint

POST /en/api/tools/markdown-linter

Request Parameters

Parameter Name Type Required Description
markdownInput textarea Yes -
ruleSet select No -
reportFormat select No -

Response Format

{
  "result": "Processed text content",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}
Text: Text

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-markdown-linter": {
      "name": "markdown-linter",
      "description": "Check Markdown for style issues: heading levels, code fences, list consistency, and more (zero-dependency rule engine)",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=markdown-linter",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

If you encounter any issues, please contact us at [email protected]