mermaid-cli
Mermaid CLI
Overview
mmdc (Mermaid CLI) converts Mermaid diagram definitions into SVG, PNG, or PDF output. It is the official command-line interface for the Mermaid diagramming library, enabling text-based diagram generation without a browser.
Write diagram definitions in .mmd files using Mermaid's declarative syntax, then run mmdc to produce publication-ready output. This is the primary tool for generating diagrams from text in automated and scripting workflows.
mmdc also serves as a syntax validator: any render attempt validates the diagram. If the Mermaid syntax is invalid, mmdc exits with a non-zero code and reports parse errors to stderr. This enables iterative validate-and-fix workflows.
Prerequisites
CRITICAL: Before proceeding, you MUST verify that mermaid-cli is installed:
mmdc --version
If mmdc is not installed:
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