@parathantl/react-email-editor

A visual drag-and-drop email template editor for React, powered by MJML. Build responsive HTML emails with a rich block-based editor, real-time preview, and full MJML round-trip support.

Features

• 12 block types: Text, Heading, Button, Image, Video, Divider, Spacer, Social, HTML, Countdown, Menu, Hero
• Drag-and-drop block reordering and section management
• Rich text editing (TipTap) with formatting toolbar
• MJML generation, parsing, and HTML compilation
• Template variable support ({{ variable }} syntax)
• Built-in persistence with localStorage or custom adapters
• Responsive editor UI with collapsible panels
• Undo/redo history (50 steps)
• Export to MJML, HTML, and PDF
• Extensible via registry pattern (add custom block types)
• Full TypeScript support with strict mode
• CSS variables for easy theming

Installation

npm install @parathantl/react-email-editor

Peer dependencies: React 18+, React DOM 18+

Optional: Install mjml-browser for HTML compilation (MJML to HTML conversion):

npm install mjml-browser

Quick Start

import { EmailEditor } from '@parathantl/react-email-editor';
import '@parathantl/react-email-editor/styles.css';

function App() {
  return (
    <div style={{ height: '100vh' }}>
      <EmailEditor
        onChange={(template) => console.log(template)}
        onSave={(mjml, html) => console.log(mjml, html)}
      />
    </div>
  );
}

Persistence

Templates auto-save and restore when you provide a persistenceKey. Each key stores a separate template, so multiple editor instances can coexist.

localStorage (default)

<EmailEditor persistenceKey="campaign-123" />

Custom Adapter (server, IndexedDB, etc.)

import type { PersistenceAdapter } from '@parathantl/react-email-editor';

const serverAdapter: PersistenceAdapter = {
  save(key, template) {
    fetch(`/api/templates/${key}`, {
      method: 'PUT',
      body: JSON.stringify(template),
      headers: { 'Content-Type': 'application/json' },
    });
  },
  load(key) {
    // Must be synchronous — preload data before rendering the editor
    return window.__PRELOADED_TEMPLATES__?.[key] ?? null;
  },
  remove(key) {
    fetch(`/api/templates/${key}`, { method: 'DELETE' });
  },
};

<EmailEditor persistenceKey="campaign-123" persistenceAdapter={serverAdapter} />

Priority order: persisted data > initialTemplate > initialMJML

Loading MJML from Another Component

Use the ref API to control the editor from parent components:

import { useRef } from 'react';
import { EmailEditor } from '@parathantl/react-email-editor';
import type { EmailEditorRef } from '@parathantl/react-email-editor';

function TemplateDesigner() {
  const editorRef = useRef<EmailEditorRef>(null);

  const loadFromServer = async () => {
    const res = await fetch('/api/templates/welcome');
    const mjml = await res.text();
    editorRef.current?.loadMJML(mjml);
  };

  const handleSave = async () => {
    const mjml = editorRef.current?.getMJML();
    const html = await editorRef.current?.getHTML();
    // Send to your API
  };

  return (
    <div>
      <button onClick={loadFromServer}>Load Template</button>
      <button onClick={handleSave}>Save</button>
      <EmailEditor ref={editorRef} persistenceKey="welcome" />
    </div>
  );
}

Or pass MJML at init time without a ref:

<EmailEditor initialMJML={mjmlString} />

Ref API

| Method | Returns | Description | |--------|---------|-------------| | getMJML() | string | Get current template as MJML | | getHTML() | Promise<string> | Compile and get HTML output | | getJSON() | EmailTemplate | Get template as JSON object | | loadMJML(source) | void | Parse MJML and load into editor | | loadJSON(template) | void | Load an EmailTemplate object | | insertBlock(type, sectionIdx?) | void | Programmatically add a block | | getVariables() | string[] | Extract {{ variable }} keys | | undo() | void | Undo last action | | redo() | void | Redo last undone action | | reset() | void | Clear all content | | clearPersisted() | void | Remove saved data for the current key | | exportPDF() | Promise<void> | Generate PDF via print dialog |

Props

| Prop | Type | Description | |------|------|-------------| | initialTemplate | EmailTemplate | Initial template object | | initialMJML | string | Initial MJML string (parsed on mount) | | variables | Variable[] | Template variables for {{ }} insertion | | imageUploadAdapter | ImageUploadAdapter | Custom image upload handler | | onChange | (template: EmailTemplate) => void | Called on every template change (debounced 150ms) | | onSave | (mjml: string, html: string) => void | Called on Ctrl+S | | onReady | () => void | Called once after editor mounts | | onVariablesChange | (customVariables: Variable[]) => void | Called when user adds/removes custom variables | | fontFamilies | string[] | Custom font options for the toolbar | | fontSizes | string[] | Custom font size options | | persistenceKey | string | Key for auto-save/restore (enables persistence) | | persistenceAdapter | PersistenceAdapter | Custom storage adapter (defaults to localStorage) | | className | string | CSS class for the outer wrapper | | style | CSSProperties | Inline styles for the outer wrapper |

Custom Icons (customIcons)

You can pass customIcons to override built-in UI icons.
Every key is optional. If you skip a key, the editor uses its default emoji/icon.

<EmailEditor
  customIcons={{
    desktop: '🖥️',
    mobile: '📱',
    undo: '↩️',
    redo: '↪️',
    addSection: '➕',
    sidebar: '📚',
    properties: '⚙️',
    visual: '🎨',
    source: '🧾',
    preview: '👁️',
    sectionDrag: '↕️',
    sectionDuplicate: '📄',
    sectionRemove: '🗑️',
    blockDuplicate: '📄',
    blockRemove: '🗑️',
    previewDesktop: '🖥️',
    previewMobile: '📱',
    paletteText: '📝',
    paletteHeading: '🔤',
    paletteButton: '🔘',
    paletteImage: '🖼️',
    paletteVideo: '▶️',
    paletteDivider: '➖',
    paletteSpacer: '↕️',
    paletteSocial: '🌐',
    paletteHtml: '💻',
    paletteCountdown: '⏰',
    paletteMenu: '📋',
    paletteHero: '⭐',
  }}
/>

Available customIcons keys

| Key | Used In | |-----|---------| | desktop | Canvas desktop view toggle | | mobile | Canvas mobile view toggle | | undo | Canvas undo button | | redo | Canvas redo button | | addSection | Canvas "Add Section" button | | sidebar | Toolbar sidebar toggle button | | properties | Toolbar properties toggle button | | visual | Toolbar Visual tab icon | | source | Toolbar Source tab icon | | preview | Toolbar Preview tab icon | | sectionDrag | Section drag handle | | sectionDuplicate | Section duplicate action | | sectionRemove | Section remove action | | blockDuplicate | Block duplicate action | | blockRemove | Block remove action | | previewDesktop | Preview panel desktop toggle | | previewMobile | Preview panel mobile toggle | | paletteText | Block palette icon for Text | | paletteHeading | Block palette icon for Heading | | paletteButton | Block palette icon for Button | | paletteImage | Block palette icon for Image | | paletteVideo | Block palette icon for Video | | paletteDivider | Block palette icon for Divider | | paletteSpacer | Block palette icon for Spacer | | paletteSocial | Block palette icon for Social | | paletteHtml | Block palette icon for HTML | | paletteCountdown | Block palette icon for Countdown | | paletteMenu | Block palette icon for Menu | | paletteHero | Block palette icon for Hero |

Block Types

| Type | Description | MJML Output | |------|-------------|-------------| | text | Rich text with formatting | <mj-text> | | heading | Heading (h1–h4) with level selector | <mj-text><h2>...</h2></mj-text> | | button | Call-to-action button | <mj-button> | | image | Image with optional link | <mj-image> | | video | Video thumbnail with play overlay | <mj-image> (linked) | | divider | Horizontal line | <mj-divider> | | spacer | Vertical spacing | <mj-spacer> | | social | Social media icon links | <mj-social> | | html | Raw HTML content | <mj-text> | | countdown | Live countdown timer with digit boxes | <mj-text> (HTML table) | | menu | Navigation menu links | <mj-navbar> | | hero | Heading + subtext + CTA button | <mj-text> (composite HTML) |

Template Variables

Define variables and insert them into text blocks as {{ variable_name }}. Variables appear as insertable chips in the sidebar, grouped by category. Users can click or drag them into any text/heading block.

<EmailEditor
  variables={[
    { key: 'first_name', sample: 'John', label: 'First Name', group: 'Contact' },
    { key: 'company', sample: 'Acme Inc', label: 'Company', group: 'Contact' },
    { key: 'unsubscribe_url', sample: '#', label: 'Unsubscribe URL', group: 'Links' },
  ]}
/>

| Variable Field | Required | Description | |---------------|----------|-------------| | key | Yes | The placeholder key used in {{ key }} syntax | | sample | No | Sample value shown in previews and tooltips | | label | No | Display label in the sidebar (defaults to key) | | group | No | Group name for organizing variables in the sidebar | | icon | No | Icon shown next to the variable chip |

Retrieving used variables

Extract which variables are actually used in the current template:

const keys = editorRef.current?.getVariables();
// ['first_name', 'unsubscribe_url']

Listening for custom variable changes

Users can create custom variables at runtime via the sidebar. Use onVariablesChange to sync these back to your backend:

<EmailEditor
  variables={backendVariables}
  onVariablesChange={(customVars) => {
    // customVars = variables created by the user in the editor
    saveToBackend(customVars);
  }}
/>

Custom Fonts

Pass custom font families and sizes to the editor. These appear in the rich text toolbar dropdowns.

<EmailEditor
  fontFamilies={[
    'Arial, sans-serif',
    'Georgia, serif',
    'Courier New, monospace',
    'Inter, sans-serif',         // your custom web font
  ]}
  fontSizes={['12px', '14px', '16px', '18px', '20px', '24px', '32px']}
/>

If omitted, the editor falls back to built-in defaults (8 font families, 11 font sizes).

Backend Integration

A complete example showing how to pass placeholders from your backend, save the template, and retrieve used variables:

import { useRef, useEffect, useState } from 'react';
import { EmailEditor } from '@parathantl/react-email-editor';
import '@parathantl/react-email-editor/styles.css';
import type { EmailEditorRef, EmailTemplate, Variable } from '@parathantl/react-email-editor';

function TemplateEditor({ templateId }: { templateId: string }) {
  const editorRef = useRef<EmailEditorRef>(null);
  const [variables, setVariables] = useState<Variable[]>([]);
  const [initialTemplate, setInitialTemplate] = useState<EmailTemplate | undefined>();

  // 1. Load variables and template from backend on mount
  useEffect(() => {
    fetch(`/api/templates/${templateId}`)
      .then((res) => res.json())
      .then((data) => {
        setVariables(data.variables);      // backend-defined placeholders
        setInitialTemplate(data.template); // saved template JSON
      });
  }, [templateId]);

  // 2. Save template + used variables to backend
  const handleSave = async (mjml: string, html: string) => {
    const usedVariables = editorRef.current?.getVariables(); // ['first_name', 'company']
    const templateJSON = editorRef.current?.getJSON();

    await fetch(`/api/templates/${templateId}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        mjml,
        html,
        template: templateJSON,
        usedVariables,
      }),
    });
  };

  // 3. Sync user-created custom variables to backend
  const handleVariablesChange = (customVars: Variable[]) => {
    fetch(`/api/templates/${templateId}/variables`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(customVars),
    });
  };

  if (!initialTemplate) return <div>Loading...</div>;

  return (
    <EmailEditor
      ref={editorRef}
      initialTemplate={initialTemplate}
      variables={variables}
      onSave={handleSave}
      onVariablesChange={handleVariablesChange}
      onChange={(template) => {
        // Optional: auto-save on every change
        console.log('Template updated');
      }}
      fontFamilies={['Arial, sans-serif', 'Georgia, serif', 'Inter, sans-serif']}
    />
  );
}

Data flow summary

Backend                          Editor                         Backend
  |                                |                              |
  |-- variables (props) --------> |                              |
  |-- initialTemplate (props) --> |                              |
  |                                |                              |
  |                                | -- onSave(mjml, html) -----> |
  |                                | -- ref.getVariables() -----> |  (used variable keys)
  |                                | -- ref.getJSON() ----------> |  (template structure)
  |                                | -- onVariablesChange() ----> |  (custom variables)

Custom Block Types

Extend the editor with your own block types using the registry:

import {
  registerBlockRenderer,
  registerBlockProperties,
  registerBlockGenerator,
} from '@parathantl/react-email-editor';

// Register a canvas renderer
registerBlockRenderer('my-block', MyBlockComponent);

// Register a properties panel
registerBlockProperties('my-block', MyBlockPropertiesPanel);

// Register an MJML generator
registerBlockGenerator('my-block', (block, indent) => {
  return `${indent}<mj-text>${block.properties.content}</mj-text>`;
});

Theming

The editor uses CSS custom properties scoped under --ee-*. Override them to match your app:

:root {
  --ee-color-primary: #8b5cf6;
  --ee-color-primary-hover: #7c3aed;
  --ee-bg-panel: #fafafa;
  --ee-border-radius: 8px;
  --ee-font-family: 'Inter', sans-serif;
}

See src/styles/variables.css for the full list of 70+ customizable tokens.

Keyboard Shortcuts

| Shortcut | Action | |----------|--------| | Ctrl/Cmd + Z | Undo | | Ctrl/Cmd + Shift + Z / Ctrl/Cmd + Y | Redo | | Ctrl/Cmd + S | Save (triggers onSave) | | Escape | Deselect block/section | | Delete / Backspace | Remove selected block or section |

Responsive Editor

The editor automatically adapts to smaller screens:

• >= 1024px — Full 3-panel layout (sidebar, canvas, properties)
• < 1024px — Panels collapse into toggleable overlays with toolbar buttons

Browser Support

Supports all modern browsers (Chrome, Firefox, Safari, Edge). Requires React 18+.

License

MIT