# MJML Email Markup MCP

> MJML Email Markup MCP transforms complex MJML code into responsive HTML emails. Stop debugging CSS for different email clients; simply give your agent the markup and get production-ready HTML that looks right everywhere, from Outlook to Gmail.

## Overview
- **Category:** developer-tools
- **Price:** Free
- **Tags:** email-templates, responsive-design, html-rendering, markup-language, email-development

## Description

Email development is a nightmare because every client—Outlook, Apple Mail, Gmail—treats HTML differently. Manually coding these templates means fighting complex nested tables and worrying about CSS inline conflicts. This MCP solves that by letting your AI agent handle the heavy lifting. You provide MJML markup (XML or JSON), and this connector transpiles it instantly into clean, responsive HTML. It’s like having a senior front-end developer available in chat. Whether you're working directly in an IDE or just chatting with your agent, you get immediate, client-standardized results. Because Vinkius hosts this MCP, you connect once and gain access to industry best practices for email design without needing a specialized build system.

## Tools

### render_mjml
Takes raw MJML markup (XML or JSON) and renders it instantly to responsive HTML.

## Prompt Examples

**Prompt:** 
```
Render this MJML code to HTML: <mjml><mj-body><mj-section><mj-column><mj-text>Hello World</mj-text></mj-column></mj-section></mj-body></mjml>
```

**Response:** 
```
I've processed your MJML markup. The transpiled responsive HTML is ready and follows all email client best practices. You can view the output in the presenter below.
```

**Prompt:** 
```
Can you use render_mjml to convert a JSON-based MJML structure into a responsive email?
```

**Response:** 
```
Absolutely. Please provide the MJML JSON string, and I will use the `render_mjml` action to generate the corresponding high-quality HTML for you.
```

**Prompt:** 
```
Generate a responsive button in MJML and render it to HTML.
```

**Response:** 
```
I've created a responsive button using `<mj-button>`. I am now running `render_mjml` to provide you with the production-ready HTML code and a visual preview.
```

## Capabilities

### Generate responsive HTML from markup
Takes raw MJML code strings and converts them into production-ready HTML that adapts to various viewing devices.

### Rapid email prototyping
Allows you to quickly iterate on full email designs directly within your chat or development environment without leaving your workflow.

### Ensure cross-client compatibility
Automatically structures the output to meet best practices for major email service providers, bypassing common client rendering errors.

### Validate complex markup syntax
Checks your input MJML code against industry standards, preventing manual formatting mistakes like improper table nesting or missing required tags.

## Use Cases

### Client needs an email template for a major product launch.
The developer asks their agent: 'Can you use `render_mjml` to take this MJML code and give me the HTML for our new feature announcement?' The agent returns perfect, cross-platform code immediately, bypassing days of manual CSS work.

### Marketing team needs to test a flyer conversion.
The marketing specialist pastes their raw JSON markup into the chat and prompts: 'Render this for me.' The agent uses `render_mjml` and provides a working, responsive HTML output for pre-deployment review.

### Designer needs to validate complex button styles.
The designer wants to see how an advanced call-to-action will render. They ask the agent to generate and then use `render_mjml` on the code, validating that the resulting HTML is clean and accurate.

## Benefits

- Avoids the 'table hacking' headache. Instead of manually nesting tables to appease Outlook, this MCP handles all client-specific structure automatically when you run `render_mjml`.
- Saves hours of debugging time. You stop spending cycles fixing minor CSS bugs across different email platforms and start focusing on content.
- Allows for rapid prototyping. Need a button or section design? Give your agent the markup, use `render_mjml`, and get an immediate visual preview to approve.
- Guarantees responsiveness. The output isn't just code; it's structurally sound HTML that adapts cleanly whether viewed on mobile or desktop.
- Keeps you in flow. You don't need to switch between a separate build tool or IDE plugin; your agent handles the conversion right where you work.

## How It Works

The bottom line is you skip the debugging steps and get finished HTML ready for deployment.

1. First, you provide the connector with your raw content—this is either a JSON or XML string of MJML markup.
2. The MCP uses the `render_mjml` tool to process this input through its engine, which translates the standardized format into browser-readable code.
3. You receive clean, responsive HTML output that follows modern email client best practices.

## Frequently Asked Questions

**Does MJML (Email Markup) MCP support JSON or XML? **
Yes, it supports both. The `render_mjml` tool accepts raw markup strings whether they are formatted as XML or JSON.

**Can I use render_mjml to just generate a simple text email?**
While you can pass minimal markup, this MCP is optimized for complex, styled emails. For basic text announcements, standard content management systems are faster.

**Is the HTML output from MJML (Email Markup) MCP production-ready? **
Yes, the output is designed to be production-grade, incorporating best practices that solve common client rendering issues. You don't need further structural cleanup.

**How does render_mjml handle responsiveness?**
It handles responsiveness by generating code structures that adapt columns and sections based on the viewing device size, ensuring a good experience across mobile, tablet, and desktop clients.

**What if my MJML markup has an error? Can render_mjml catch it?**
The process is designed to validate your syntax. If there's an issue with the input structure, the agent will alert you before attempting to generate the HTML.