Flowchart

Core Diagram Type

Full IDE intelligence (completions, inspections, formatting, refactoring) is available with a Core or Studio license. Compare editions →

Mermaid Studio provides the most comprehensive flowchart support of any IntelliJ plugin, turning your IDE into a first-class editor for process flows, decision trees, and system workflows. Flowcharts are the most versatile diagram type in Mermaid.js, and every piece of IDE intelligence in Mermaid Studio — completions, refactoring, inspections, Code Vision, and the Style Pane — is tuned for them.

Syntax Highlighting

Syntax highlighting integrates directly with IntelliJ’s color scheme system, so diagram colors always match your editor theme.

Armada Dark

Islands Dark

Islands Light

IDE Support

Mermaid Studio provides comprehensive support for flowcharts:

• Syntax highlighting - Color-coded keywords, nodes, edges, and HTML tags in labels
• Code completion - Suggestions for node shapes, arrow types, keywords, and icons in generalized shapes
• Refactoring - Rename node IDs, subgraph IDs, CSS class names, and edge IDs across your entire diagram
• Find usages - See everywhere a node, subgraph, or CSS class is referenced
• Go to Related - Navigate between links and their linkStyle declarations, and from linkStyle indices to the declaring link
• Code folding - Collapse subgraphs in large diagrams
• Formatting - Auto-format your diagram code with multiline string alignment
• Inspections - Detect undefined nodes, duplicate IDs, non-referenceable subgraph IDs, unclosed HTML tags, CSS class suffixes on generalized shapes, and more
• Brace matching - Navigate between paired brackets
• Code Vision - Relationship counts at a glance
• Color provider - See hex colors inline in style definitions
• Structure view - Hierarchical overview with subgraph nesting, node deduplication, and a unified Styles section
• Style Pane - Visual property editor with presets, node shape editing, and link styling controls
• Documentation - Hover with Cmd/Ctrl to see node labels, subgraph details, and type icons
• Navigation bar - Quick access to diagram elements with context-aware icons

Quick Syntax Reference

Directions:

• TD or TB - Top to bottom
• LR - Left to right
• RL - Right to left
• BT - Bottom to top

Node shapes:

• [Text] - Rectangle
• ([Text]) - Stadium/pill
• {Text} - Diamond (decision)
• [/Text/] - Parallelogram (input/output)
• ((Text)) - Circle

Edges:

• --> - Arrow
• --- - Line
• -.-> - Dotted arrow
• ==> - Thick arrow
• -->|Label| - Arrow with text
• animate A --> B - Animated edge

Subgraphs:

flowchart LR
    subgraph Backend
        API --> DB
    end
    subgraph Frontend
        UI --> API
    end

For the complete syntax reference, see the Mermaid.js Flowchart documentation.