Mermaid

Mermaid revolutionizes technical documentation by letting developers create complex diagrams using simple text definitions. Instead of wrestling with visual design tools, you write diagram specifications in an intuitive syntax that renders instantly into professional-quality visuals.

Perfect for version control and collaboration, Mermaid diagrams live alongside your code as plain text files. This means they're diff-friendly, easily reviewable in pull requests, and maintainable by anyone who can edit text. No more binary image files cluttering your repositories or outdated diagrams that nobody wants to update.

The library supports an impressive range of diagram types including flowcharts, sequence diagrams, Gantt charts, class diagrams, state diagrams, entity relationship diagrams, user journey maps, and mind maps. Each diagram type uses domain-specific syntax that's both readable and expressive, making documentation feel like a natural extension of coding.

With over 85,000 GitHub stars and widespread adoption across documentation platforms like GitLab, GitHub, and Notion, Mermaid has become the de facto standard for diagrams-as-code. It integrates seamlessly into markdown workflows, CI/CD pipelines, and documentation generators, enabling automated diagram generation and consistent visual communication across teams.