mjml-handlebars

Use MJML to pregenerate your emails, then Handlebars with i18n support to generate your final emails (html and text).

BONUS: Live preview your templates with sample variables for all your languages.

Installation

npm install mjml-handlebars
yarn add mjml-handlebars

Add this scripts to your package.json

"emails": "mjml-handlebars",

Use this if you are using custom root folder and dotenv

"emails": "node -r dotenv/config node_modules/.bin/mjml-handlebars",

For live preview support:

npm install -D npm-run-all @compodoc/live-server nodemon
yarn add -D npm-run-all @compodoc/live-server nodemon

Additional package.json scripts:

"emails:dev": "run-p emails:watch emails:preview",
"emails:watch": "nodemon --exec 'npm run emails' -e mjml -i emails/output",
"emails:preview": "live-server -q emails/preview"

Add emails/preview to your .gitignore

Usage

Generate an emails/templates folder, add your mjml templates there. If your run the emails script, the emails/output and emails/preview folders will be generated with the compiled assets.

By default it uses {cwd}/emails as root folder, can be changed with MJML_HANDLEBARS_ROOT environment variable.

Run emails:dev to watch for changes and a live server preview

To generate the final email, the precompiled version of the handlebars email will be used to improve performance. Example:

import { generateEmail } from 'mjml-handlebars'

const { html, text, subject } = generateEmail(
  'welcome',
  {
    email: '[email protected]',
    items: [{ name: 'item1' }, { name: 'item2' }, { name: 'item3' }],
    showButton: true,
    disclaimer: 'This is the disclaimer',
  },
  'de', // Language
  'en' // Optional fallback Language
)

MJML templates powerups

There are 4 required comment blocks (only available for main templates, not partials):

• text (plain text): contains the email in text mode (with same handlebars support as the mjml part)
• subject (plain text): contains the email subject (with same handlebars support as the mjml part)
• i18n (YAML): languages and messages for translations
• vars (YAML): sample variables for previewing

There is support for logical operators, taken from here

Example template:

<mjml>
  <mj-head>
    <mj-include path="./partials/head.mjml" />
  </mj-head>

  <mj-body>
    <mj-include path="./partials/header.mjml" />
    <mj-section mj-class="main">
      <mj-column>
        <mj-text mj-class="title">
          {{__ "greetings" email=email}}
        </mj-text>
        <mj-text>
          {{__ "welcome"}}
        </mj-text>
        <mj-raw>{{#if showButton}}</mj-raw>
        <mj-button href="#">
          Go to my account 
        </mj-button>
        <mj-raw>{{/if}}</mj-raw>
        <mj-raw>{{#each items}}</mj-raw>
        <mj-text>Item: <b>{{this.name}}</b></mj-text>
        <mj-raw>{{/each}}</mj-raw>

        <mj-text>
        {{#if (ne type 'show') }}
        {{disclaimer}}
        {{else}}
        no disclaimer
        {{/if}}
        </mj-text>
      </mj-column>
    </mj-section>
    <mj-include path="./partials/footer.mjml" />
  </mj-body>
</mjml>

<!-- text
{{__ "greetings" email=email}}

{{__ "welcome"}}
-->

<!-- subject
{{__ "greetings" email=email}}
-->

<!-- vars
email: [email protected] 
items: 
  - name: item1
  - name: item2
  - name: item3
showButton: true
type: 'show'
# disclaimer: 'This is the disclaimer'
-->

<!-- i18n
en:
  greetings: hello {{email}}
  welcome: Welcome to my company
es:
  greetings: hola {{email}}
  welcome: Bienvenido a mi empresa
-->

See a working example project at /example.

License

MIT