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We recommend installing and using MJML locally, in a project folder where you'll use MJML:

npm install mjml

In the folder where you installed MJML you can now run:

./node_modules/.bin/mjml input.mjml

To avoid typing ./node_modules/.bin/, add it to your PATH:

export PATH="$PATH:./node_modules/.bin"

You can now run MJML directly, in that folder:

mjml input.mjml

MJML is written with NodeJS You can download and install the MJML engine from NPM.

Command Line Interface

In addition to the translation engine, which converts MJML to email HTML, we've bundled a Command Line Interface (CLI) helping you to achieve the basic features it offers and integrate it seamlessly in your development flow.

Render MJML to HTML

mjml input.mjml

It will output a HTML file called input.html. Input can also be a directory.

Migrate MJML3 to MJML4

$> mjml -m input.mjml -o result.mjml

It will output a MJML file called result.mjml.

Validate MJML

$> mjml -v input.mjml

It will log validation errors. If there are errors, exits with code 1. Otherwise, exits with code 0.

Render and redirect the result to stdout

mjml -s input.mjml

# or

mjml --stdout input.mjml

Render and redirect the result to a file

mjml input.mjml -o my-email.html

# or

mjml input.mjml --output my-email.html

You can output the resulting email responsive HTML in a file. If the output file does not exist it will be created, but output directories must already exist. If output is a directory, output file(s) will be output/input-file-name.html

Set the validation mode

mjml -l skip -r input.mjml

Accepted values are

  • 'normal' : (default) will display validation messages but compile anyway
  • 'skip' : the file is rendered without being validated
  • 'strict' : will throw an error if validation fails

Watch changes on a file

mjml -w input.mjml

# or

mjml --watch input.mjml

If you like live-coding, you might want to use the -w option that enables you to re-render your file every time you save it. It can be time-saving when you can just split you screen and see the HTML output modified when you modify your MJML.

Of course, the -w option can be used with an --output option too.

Available options

mjml input.mjml --config.optionName value

# or

mjml input.mjml -c.optionName value

All the options that can be passed to mjml2html (see general documentation) can be provided. The most common ones are detailed below.

Minify and beautify the output HTML

$> mjml input.mjml --config.beautify true --config.minify false

These are the default options.

Change minify options

$> mjml input.mjml --config.minifyOptions='{"minifyCSS": true, "removeEmptyAttributes": false}'

The defaults are "collapseWhitespace": true, "minifyCSS": false, "removeEmptyAttributes": true
See html-minifier documentation for more available options

Change juice options (library used for inlining mj-syle css)

$> mjml input.mjml --config.minifyOptions='{"preserveImportant": true}'

The defaults are "applyStyleTags": false, "insertPreservedExtraCss": false, "removeStyleTags": false
See juice documentation for more available options

Preserve specific tags when using inline mj-style

$> mjml input.mjml --config.juicePreserveTags='{"myTag": { "start": "<#", "end": "</#" }}'

When using <mj-style inline="inline"> the css will be inlined using the juice library. As a side effect, juice will convert all tags' attributes into lower case. If you need to preserve some cases (i.e. for a templating lib) you can specify the tags to preserve. With the example above, all tags of the form <# myVar="" > or </# myVar="" > will be left untouched. By default juice already ignores <% EJS %> and {{ HBS }} tags.

Override base path for mj-include relative paths

$> mjml ./my-project/input.mjml --config.filePath ./my-partials/

If you like to keep your partials together and you want to be able to mj-include them without having to change the relative path of the includes depending on the compiled file path, you can use this option. In this exemple, <mj-include path="./header.mjml" /> will include ./my-partials/header.mjml, ignoring the actual path of input.mjml.

Log error stack

$> mjml input.mjml --config.stack true