Introduction

MJML is a markup language created by Mailjet and designed to reduce the pain of coding a responsive email. Its semantic syntax makes the language easy and straightforward while its rich standard components library shortens your development time and lightens your email codebase. MJML’s open-source engine takes care of translating the MJML you wrote into responsive HTML.

Installation

You can install MJML with NPM to use it with NodeJS or the Command Line Interface. If you're not sure what those are, head over to Usage for other ways to use MJML.

npm install mjml

Usage

Online

Don't want to install anything? Use the free online editor!

Applications and plugins

MJML comes with tools and plugins, check out:

• Visual Studio Code plugin (MJML is included). Also available at Visual Studio Code Marketplace and the Open VSX Registry or in the extensions tab of the Visual Studio Code app.
• Sublime Text plugin (MJML needs to be installed separately)

For more tools, check the Community page.

Command line interface

Compiles the file and outputs the HTML generated in output.html

mjml input.mjml -o output.html

You can pass optional arguments to the CLI and combine them.

| argument | description | default value | | -------------------------------- | ------------------------------------------------------ | ------------- | | mjml [input] -o [output] | Writes the output to [output] | | | mjml [input] -s | Writes the output to stdout | | | mjml [input] -s --noStdoutFileComment | Writes the output to stdout without file comment in the first line | | | mjml -w [input] | Watches the changes made to [input] (file or folder) | | | mjml [input] --config.allowIncludes | Enables mj-include processing (true or false) | false | | mjml [input] --config.allowMixedSyntax | Allows mixing block and CSS variable syntax when sanitizeStyles is enabled (true or false) | false | | mjml [input] --config.beautify | Beautifies the output (true or false) | true | | mjml [input] --config.includePath | Adds allowlisted include root(s), as a string path or JSON array of paths | | | mjml [input] --config.minify | Minifies the output (true or false) | false | | mjml [input] --config.minifyOptions | Options for HTML minifier, use minifyCss to control CSS minification | See mjml-cli documentation | | mjml [input] --config.juicePreserveTags | Preserve some tags when inlining CSS | See mjml-cli documentation | | mjml [input] --config.mjmlConfigPath | Path to .mjmlconfig file for custom components | current working directory | | mjml [input] --config.sanitizeStyles | Sanitizes template variables inside CSS before minification (true or false) | false | | mjml [input] --config.useMjmlConfigOptions | Allows to use the options attribute from .mjmlconfig file | false | | mjml [input] --config.templateSyntax | Sets custom template delimiters as JSON array ([{"prefix":"{{","suffix":"}}"}]) | [{"prefix":"{{","suffix":"}}"},{"prefix":"[[","suffix":"]]"}] |

See mjml-cli documentation for more information about config options.

Inside Node.js

import mjml2html from 'mjml'

/*
  Compile an mjml string
*/
async function renderMjml() {
  const htmlOutput = await mjml2html(`
    <mjml>
      <mj-body>
        <mj-section>
          <mj-column>
            <mj-text>
              Hello World!
            </mj-text>
          </mj-column>
        </mj-section>
      </mj-body>
    </mjml>
  `, options)

  /*
    Print the responsive HTML generated and MJML errors if any
  */
  console.log(htmlOutput)
}

renderMjml()

You can pass optional options as an object to the mjml2html function:

| option | unit | description | default value | | -------------------- | ------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------- | | allowMixedSyntax | boolean | Allows mixed block/value/property template syntaxes during CSS sanitization | false | | beautify | boolean | Option to beautify the HTML output | false | | filePath | string | Path of file, used for relative paths in mj-include instances | . | | fonts | object | Default fonts imported in the HTML rendered by MJML | See in index.js | | ignoreIncludes | boolean | Option to ignore mj-include instances | true | | includePath | string or string[] | Additional allowlisted include root(s), used when ignoreIncludes is false | | | juicePreserveTags | object | Preserve some tags when inlining CSS, see documentation for more info | | | keepComments | boolean | Option to keep comments in the HTML output | true | | minify | boolean | Option to minify the HTML output | false | | minifyOptions | object | Options for htmlnano minification (including minifyCss), see documentation for more info | | | mjmlConfigPath | string | The path or directory of the .mjmlconfig file (for custom components use) | process.cwd() | | preprocessors | array of functions | Preprocessors applied to the xml before parsing. Input must be xml, not json. Functions must be (xml: string) => string | [] | | sanitizeStyles | boolean | Sanitizes template variables in CSS before minification | false | | templateSyntax | array of objects | Custom template delimiters used by sanitization ([{ prefix, suffix }]) | [{"prefix":"{{","suffix":"}}"},{"prefix":"[[","suffix":"]]"}] | | useMjmlConfigOptions | boolean | Allows to use the options attribute from .mjmlconfig file | false | | validationLevel | string | Available values for the validator: strict, soft, skip | soft. |

Client-side (in browser)

var mjml2html = require('mjml-browser')

/*
  Compile a mjml string
*/
mjml2html(`
  <mjml>
    <mj-body>
      <mj-section>
        <mj-column>
          <mj-text>
            Hello World!
          </mj-text>
        </mj-column>
      </mj-section>
    </mj-body>
  </mjml>
`, options).then(function (htmlOutput) {
  /*
    Print the responsive HTML generated and MJML errors if any
  */
  console.log(htmlOutput)
})

API

A free-to-use MJML API is available to make it easy to integrate MJML in your application. Head over here to learn more about the API.

MJML Slack

MJML wouldn't be as cool without its amazing community. Head over the Community Slack to meet fellow MJML'ers.