Draw a Sequence Diagram

Diagram how systems or people interact over time.

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💡 Write diagrams in Mermaid syntax — flowcharts, sequence diagrams, Gantt charts, class diagrams, and more — and export as SVG or PNG. Rendering happens entirely in your browser; nothing is uploaded.

sequence diagrams tips

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Use "->>" for a request and "-->>" for a response between participants.

👥

Define short aliases (participant U as User) to keep the diagram readable.

📑

Great for documenting API calls and auth flows in a README.

🔒

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