| 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.
