Welcome to Mermaid
This tutorial provides an in-depth, chapter-wise guide to Mermaid.js, a JavaScript-based diagramming tool that renders diagrams from text definitions.
We begin with an introduction and installation instructions, then cover basic syntax and diagram types (flowcharts, sequence diagrams, class/state/ER diagrams, Gantt charts, pie charts, and requirement diagrams).
Each chapter includes clear explanations, minimal code examples in Mermaid syntax, and references to Mermaid’s official documentation.
We illustrate styling (themes, classes, layouts, and configuration), interactivity (links and click events), embedding (in HTML, Markdown, VS Code, static sites) and tools (CLI, live editor).
Advanced topics include directives, custom theming, plugins, troubleshooting, performance, security, and best practices. Tables summarize and compare diagram types, configuration options, and directives.
Exercises with solutions reinforce key concepts. Wherever possible, we cite official Mermaid sources.
The Complete Mermaid.js Tutorial: From Basics to Advanced
Mermaid.js is a powerful "diagrams-as-code" tool that allows you to generate complex charts, graphs, and system architectures using a simple Markdown-like text syntax. Because it is text-based, your diagrams can live alongside your code, be easily version-controlled in Git, and render dynamically in platforms like GitHub, GitLab, Notion, and Obsidian.
This tutorial will take you from absolute beginner to advanced architect, chapter by chapter.