Mermaid in Documentation: Best Practices
How to use Mermaid diagrams in README, Confluence, Notion, and documentation sites effectively.
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Tags: Mermaid diagrams documentation, diagram as code docs, Mermaid GitHub integration
Mermaid in Documentation: Best Practices Mermaid.js is an open-source JavaScript diagramming library. The official Mermaid documentation covers all supported diagram types. GitHub's Mermaid support documentation explains how to embed diagrams in repositories. Mermaid diagrams are used in 300+ million repositories on GitHub and generate over 100 billion diagram renders annually according to Mermaid documentation. Mermaid diagrams live alongside code, version-control cleanly, and render natively on GitHub and GitLab. Using them effectively requires knowing which diagram types suit which documentation needs and how to integrate them into each platform. --- What is why mermaid over screenshot diagrams? Screenshot-based diagrams in documentation have three failure modes: They go stale as…
Frequently Asked Questions
How do I add Mermaid diagrams to GitHub README?
Wrap Mermaid syntax in a fenced code block with the `mermaid` language identifier. GitHub renders these blocks natively in README.md, issues, pull requests, and wiki pages. No extension or plugin required — it works in standard markdown on GitHub.com.
How do I use Mermaid in Notion?
Notion does not natively render Mermaid. You can use a code block with `mermaid` language to store the syntax, then embed a Mermaid live editor link for preview. Alternatively, render the diagram externally, export as SVG or PNG, and embed the image.
What Mermaid diagram types work best for docs?
Flowcharts work best for process and decision documentation. Sequence diagrams work best for API flows and protocols. ER diagrams work best for database schemas. State diagrams work best for lifecycle documentation. Class diagrams work best for object models.
How do I export Mermaid as SVG or PNG?
Use the Mermaid CLI: `npm install -g @mermaid-js/mermaid-cli && mmdc -i diagram.mmd -o diagram.svg`. Alternatively, use a browser-based Mermaid renderer and use the browser's SVG export or screenshot. SVG is preferable for documentation sites as it scales without pixelation.
What is diagram-as-code?
Diagram-as-code means defining diagrams in a text-based format that can be version-controlled, diffed in pull requests, and rendered automatically. Mermaid, PlantUML, D2, and Structurizr are examples. Unlike binary diagram files, text diagrams are reviewable and maintainable.
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