Mermaid Diagram Renderer Guide
Render Mermaid diagrams — flowcharts, sequence diagrams, ER diagrams — in the browser with live preview.
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Tags: Mermaid diagram renderer, Mermaid.js live preview, diagram as code tool
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Frequently Asked Questions
What is Mermaid.js?
Mermaid.js is a JavaScript library that converts text-based diagram syntax into SVG visualizations. It supports flowcharts, sequence diagrams, class diagrams, state diagrams, ER diagrams, Gantt charts, pie charts, and more. GitHub renders Mermaid natively in markdown.
How do I create a flowchart with Mermaid?
Start with `flowchart LR` (left-right) or `flowchart TD` (top-down), then define nodes and edges. Nodes can be rectangles `[text]`, rounded `(text)`, diamonds `{text}`, or circles `((text))`. Connect them with `-->` for arrows or `---` for lines.
How do I render Mermaid in GitHub?
Wrap Mermaid syntax in a fenced code block with the `mermaid` language identifier: ` ```mermaid ... ``` `. GitHub renders these blocks as diagrams in README files, issues, and pull requests. No plugin or extension required.
What is a sequence diagram in Mermaid?
A sequence diagram shows interactions between actors (participants) over time. Use `sequenceDiagram`, declare participants with `participant`, and show messages with `Actor1->>Actor2: message`. Activation boxes, loops, and alternative paths are also supported.
How do I use Mermaid in documentation?
Mermaid works natively in GitHub and GitLab markdown. For Docusaurus, use the `@docusaurus/plugin-ideal-image` or mdx-mermaid. For MkDocs, add `pymdownx.superfences` with `custom_fences`. Notion renders Mermaid in code blocks via a third-party extension.
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