mermaid

name	mermaid
description	Generate diagrams from text using the Mermaid CLI. Use for creating flowcharts, sequence diagrams, ERDs, Gantt charts, class diagrams, state diagrams, pie charts, and more.
metadata	{"version":"1.0.0","displayName":"Mermaid CLI","author":"gremlin","category":"data","icon":"diagram","tags":["diagram","chart","flowchart","visualization","documentation"],"install":"which mmdc || npm install -g @mermaid-js/mermaid-cli\n","allowedCommands":["mmdc"]}

Mermaid CLI

You have access to mmdc (Mermaid CLI) for generating diagrams from text definitions.

Usage

Write a .mmd file with the diagram definition, then render it:

mmdc -i diagram.mmd -o diagram.png
mmdc -i diagram.mmd -o diagram.svg
mmdc -i diagram.mmd -o diagram.pdf

Tips

• Supported output formats: png, svg, pdf.
• Set dimensions: mmdc -i diagram.mmd -o diagram.png -w 1200 -H 800
• Set background: --backgroundColor transparent for PNGs with no background.
• Use -t dark or -t forest or -t neutral for different themes.
• Use a config file for advanced theming: mmdc -i diagram.mmd -o out.png -c config.json
• Pipe from stdin: echo "graph LR; A-->B" | mmdc -i - -o diagram.png
• For complex diagrams, write the .mmd file first rather than piping — easier to debug syntax errors.
• If rendering fails, check for unescaped special characters in labels — wrap labels in quotes.
• Mermaid uses graph (alias flowchart), sequenceDiagram, classDiagram, stateDiagram-v2, erDiagram, gantt, pie, gitgraph, mindmap, timeline, and more.