@memberjunction/ng-markdown

A feature-rich Angular component for rendering Markdown content with syntax highlighting, Mermaid diagrams, collapsible sections, GitHub-style alerts, and SVG rendering.

Installation

npm install @memberjunction/ng-markdown

Overview

The Markdown component replaces ngx-markdown with a MemberJunction-native implementation. It uses marked for parsing, Prism.js for syntax highlighting, and Mermaid for diagram rendering. The module does not use forRoot() — simply import MarkdownModule wherever needed.

flowchart LR
    subgraph Input["Markdown Source"]
        A["Raw Markdown String"]
    end
    subgraph Parser["Parsing Pipeline"]
        B["marked parser"]
        B --> C["marked-highlight (Prism.js)"]
        B --> D["marked-alert (GitHub alerts)"]
        B --> E["marked-smartypants (typography)"]
    end
    subgraph Render["Rendering"]
        C --> F["Syntax-highlighted code blocks"]
        D --> G["Alert blockquotes"]
        B --> H["Mermaid diagrams"]
        B --> I["SVG code blocks"]
    end

    A --> B

    style Input fill:#2d6a9f,stroke:#1a4971,color:#fff
    style Parser fill:#7c5295,stroke:#563a6b,color:#fff
    style Render fill:#2d8659,stroke:#1a5c3a,color:#fff

Usage

Module Import

import { MarkdownModule } from '@memberjunction/ng-markdown';

@NgModule({
  imports: [MarkdownModule]  // No forRoot() needed
})
export class YourModule {}

Basic Usage

<mj-markdown [data]="markdownContent"></mj-markdown>

Full Configuration

<mj-markdown
  [data]="content"
  [enableMermaid]="true"
  [enableCollapsibleHeadings]="true"
  [collapsibleHeadingLevel]="2"
  [autoExpandLevels]="[2]"
  [enableCodeCopy]="true"
  [enableAlerts]="true"
  [enableSmartypants]="true"
  [enableSvgRenderer]="true"
  [enableHtml]="false"
  [mermaidTheme]="'default'"
  (rendered)="onRendered($event)"
  (headingClick)="onHeadingClick($event)"
  (codeCopied)="onCodeCopied($event)">
</mj-markdown>

Key Features

Feature	Default	Description
Syntax highlighting	Enabled	Prism.js with Okaidia theme
Mermaid diagrams	Enabled	Render mermaid code blocks as diagrams
Code copy button	Enabled	Copy-to-clipboard on hover
GitHub-style alerts	Enabled	[!NOTE], [!TIP], [!WARNING] blockquotes
Smartypants typography	Enabled	Curly quotes, em/en dashes, ellipsis
SVG rendering	Enabled	Render SVG code blocks as images
Collapsible headings	Disabled	Expand/collapse heading sections
HTML passthrough	Disabled	Raw HTML rendering (security-sensitive)
JavaScript	Disabled	Allow JS in HTML (use only for trusted content)

Configuration Inputs

Input	Type	Default	Description
data	string	''	Markdown content to render
enableHighlight	boolean	true	Prism.js syntax highlighting
enableMermaid	boolean	true	Mermaid diagram rendering
enableCodeCopy	boolean	true	Copy button on code blocks
enableCollapsibleHeadings	boolean	false	Collapsible heading sections
collapsibleHeadingLevel	1-6	2	Heading level to start collapsing
collapsibleDefaultExpanded	boolean	true	Default expansion state
autoExpandLevels	number[]	undefined	Specific levels to auto-expand
enableAlerts	boolean	true	GitHub-style alerts
enableSmartypants	boolean	true	Typography improvements
enableSvgRenderer	boolean	true	SVG code block rendering
enableHtml	boolean	false	Raw HTML passthrough
enableJavaScript	boolean	false	Allow JS in HTML
enableHeadingIds	boolean	true	Generate heading IDs for anchors
headingIdPrefix	string	''	Prefix for heading IDs
enableLineNumbers	boolean	false	Show line numbers in code blocks
containerClass	string	''	Custom CSS class for container
mermaidTheme	string	'default'	Mermaid theme (default/dark/forest/neutral/base)
sanitize	boolean	true	Sanitize HTML output

Outputs

Event	Type	Description
rendered	MarkdownRenderEvent	Emitted when rendering completes
headingClick	HeadingInfo	Emitted when a heading is clicked
codeCopied	string	Emitted when code is copied to clipboard

Migration from ngx-markdown

1. Replace imports: 'ngx-markdown' to '@memberjunction/ng-markdown'
2. Remove forRoot() from module imports
3. Update selectors: <markdown> to <mj-markdown>
4. The element property is preserved for backward compatibility

Dependencies

• marked — Markdown parser
• marked-alert — GitHub-style alerts
• marked-highlight — Syntax highlighting integration
• marked-smartypants — Typography improvements
• prismjs — Syntax highlighting
• mermaid — Diagram rendering

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