Report Tool or Give Us Suggestions

MDX Formatter

Format and beautify MDX files online. Free MDX formatter with syntax highlighting, file upload, and URL loading support.

L ading . . .

What is MDX Formatter?

A MDX Formatter is an online tool that helps you format and beautify MDX (Markdown + JSX) files. MDX is an authorable format that lets you seamlessly write JSX in your Markdown documents, combining the simplicity of Markdown with the power of React components. Our MDX Formatter helps you clean up unformatted or messy MDX code, making it more readable and maintainable.

MDX files are commonly used in modern web development, especially with frameworks like Next.js, Gatsby, and other React-based documentation systems. They allow developers to write content in Markdown while embedding interactive React components, creating a powerful authoring experience.

How to Use the MDX Formatter

Using our MDX Formatter is simple and straightforward:

  1. Enter Your MDX Code: Paste your MDX code into the input editor, upload an MDX file (.mdx or .md), or load from a URL
  2. Auto-Formatting: The tool automatically formats your MDX code as you type, with a slight delay for performance
  3. Load from URL: Enter a URL in the "Load from URL" field and click "Load" to fetch and format MDX files from remote sources
  4. Review Output: Check the formatted output in the right panel with proper indentation and structure
  5. Copy or Download: Use the copy button to copy the formatted MDX or download it as a file

Features of MDX Formatter

Our MDX Formatter includes the following features:

  • Real-time Formatting: Automatically formats MDX code as you type with optimized performance
  • JSX Formatting: Properly formats JSX components embedded in Markdown
  • Markdown Preservation: Preserves Markdown syntax while formatting JSX elements
  • File Upload: Upload MDX or Markdown files directly to the formatter
  • URL Loading: Load MDX files from external URLs for remote formatting
  • Syntax Highlighting: Color-coded syntax for better readability
  • Copy & Download: Copy formatted MDX to clipboard or download as a file
  • Sample Code: Load sample MDX code to see the formatter in action
  • Two-Column Layout: Side-by-side view of input and formatted output

What is MDX?

MDX (Markdown + JSX) is a format that combines Markdown's simplicity with JSX's power. It allows you to:

  • Write content in Markdown syntax
  • Embed React components directly in your Markdown
  • Use JSX expressions and components within Markdown documents
  • Create interactive documentation and content

Example MDX Code

Input (Unformatted):

# Hello, _world_!
Below is an example of JSX embedded in Markdown. 
**Try and change the background color!**

This is JSX, Health is Wealth

## Features - ✅ **Markdown** support - ✅ **JSX** components - ✅ **Interactive** elements \`\`\`jsx function MyComponent() { return
Hello World
; } \`\`\`

Output (Formatted):

# Hello, _world_!

Below is an example of JSX embedded in Markdown. 
**Try and change the background color!**

This is JSX, Health is Wealth

## Features - ✅ **Markdown** support - ✅ **JSX** components - ✅ **Interactive** elements \`\`\`jsx function MyComponent() { return
Hello World
; } \`\`\`

Common Use Cases

MDX Formatter is useful for various scenarios:

  • Documentation: Format MDX files used in documentation sites like Docusaurus, Next.js docs, and Gatsby
  • Blog Posts: Format MDX content for blog platforms that support MDX
  • Component Libraries: Format MDX examples in component documentation
  • Code Review: Clean up MDX files before committing to version control
  • Learning MDX: Understand proper MDX formatting and structure
  • Content Migration: Format MDX files when migrating from other formats
  • Team Collaboration: Ensure consistent MDX formatting across team members
  • Remote Files: Format MDX files loaded from remote URLs or APIs

MDX Syntax Basics

MDX combines Markdown and JSX syntax. Here are key concepts:

  • Markdown Elements: Use standard Markdown syntax for headings, lists, links, images, code blocks, etc.
  • JSX Components: Embed React components using JSX syntax: <MyComponent />
  • JSX Expressions: Use curly braces for JavaScript expressions: {variable}
  • Code Blocks: Use triple backticks with language identifier for syntax highlighting
  • HTML Elements: Can use HTML elements directly in MDX
  • Import Statements: Import React components at the top of MDX files
  • Export Statements: Export metadata or components from MDX files

Loading MDX from URL

You can load MDX files directly from URLs:

  1. Enter the URL in the "Load from URL" field
  2. Click the "Load" button
  3. The MDX content will be fetched and loaded into the editor
  4. The formatter will automatically format the loaded content

You can also use URL parameters to automatically load MDX files. Add ?url=YOUR_URL to the tool's URL to automatically load and format the MDX file.

Best Practices for MDX Formatting

Formatting Tips:

  • Consistent Indentation: Use 2 spaces for indentation in JSX blocks
  • Proper Spacing: Add blank lines between Markdown sections and JSX components
  • JSX Attributes: Format JSX attributes with proper line breaks for readability
  • Code Blocks: Keep code blocks properly formatted with correct indentation
  • Component Organization: Organize JSX components with consistent formatting
  • Markdown Structure: Maintain proper Markdown structure while formatting JSX

MDX vs Markdown

While Markdown is a simple markup language for formatting text, MDX extends Markdown with JSX capabilities:

  • Markdown: Pure text formatting with headers, lists, links, images, code blocks
  • MDX: Everything in Markdown plus React components, JSX expressions, and interactive elements
  • Use Cases: Markdown for simple documentation; MDX for interactive content and component-based documentation
  • File Extensions: Markdown uses .md; MDX uses .mdx

Disclaimer

While we strive to provide accurate formatting, please note that MDX formatting can be complex due to the combination of Markdown and JSX syntax. The formatter handles common cases well, but some edge cases or complex JSX structures might require manual adjustment. Always review the formatted output to ensure it meets your needs and maintains the intended structure.

Frequently Asked Questions

What is MDX?

MDX (Markdown + JSX) is a format that allows you to write Markdown with embedded JSX components. It combines the simplicity of Markdown with the power of React, enabling you to create interactive content and documentation.

Why would I need to format MDX files?

Formatting MDX files improves readability, maintains consistency across projects, makes code reviews easier, and helps ensure proper structure. Well-formatted MDX is easier to maintain and understand.

Can I format both .mdx and .md files?

Yes, our MDX Formatter accepts both .mdx and .md files. While .mdx files are specifically designed for MDX content, .md files can also contain MDX syntax and will be formatted accordingly.

Does the formatter preserve my Markdown syntax?

Yes, the formatter preserves Markdown syntax while formatting JSX components. It maintains the structure of your Markdown content while improving the formatting of embedded JSX elements.

Can I load MDX files from remote URLs?

Yes, you can load MDX files from URLs using the "Load from URL" feature. Simply enter the URL and click "Load" to fetch and format the remote MDX file. Note that CORS policies may affect loading from some domains.

Is the MDX Formatter free to use?

Yes, our MDX Formatter is completely free to use. Simply input your MDX code, upload a file, or load from a URL to format your content instantly.

Tags

MDX Markdown JSX React Code Formatting Web Development Documentation
logo OnlineMiniTools

OnlineMiniTools.com is your ultimate destination for a wide range of web-based tools, all available for free.

Feel free to reach out with any suggestions or improvements for any tool at admin@onlineminitools.com. We value your feedback and are continuously striving to enhance the tool's functionality.

© 2026 OnlineMiniTools . All rights reserved.

Hosted on Hostinger

v1.8.7