Mailjet Markup Language File

MJML is a markup language that web developers can use to create responsive emails and templates. It features HTML-like syntax and elements, as well as a standard component library that developers can draw from to reduce the time they spend coding responsive email elements.

Often, developers save the emails, templates, and elements they've created using MJML as MJML files. For example, when a developer creates a new project in the MJML app, MJML saves that project's base content in a file named index.mjml . If a developer creates a new project that contains a header and footer, MJML saves the project's header and footer elements in files named header.mjml and footer.mjml . (In this case, the developer's index.mjml file will contain references to their header.mjml and footer.mjml files.)

While developers most often create MJML files from within the MJML app, they can use any text editor to create MJML files. Mailjet maintains plug-ins for Microsoft Visual Studio Code, Github Atom, and Sublime Text, to make it easier for developers to create MJML files in those apps.

index.html - Defines the main contents of an MJML email.

header.html - Defines an MJML email header.

footer.html - Defines an MJML email footer.

It is best to open MJML files with Mailjet's official MJML application. MJML not only highlights an MJML file's syntax, but also:

However, you can open MJML files with any text editor. Plug-ins for Microsoft Visual Studio Code , Github Atom , and Sublime Text allow those programs to highlight MJML syntax correctly.

You can use the MJML app to convert the email template or element an MJML file describes to the .HTML (Hypertext Markup Language) format. To do so:

Programs that open MJML files

Updated: September 15, 2023