3 Mermaid Diagrams You Didn't Know Exist

Most people discover Mermaid through flowcharts. That makes sense: flowcharts are easy to read, easy to write, and useful in almost every technical document. The same goes for sequence diagrams, which are now common in API docs, architecture notes, and incident writeups. But Mermaid can do more than boxes and arrows. Some of its most useful diagram types are still underused, even though they solve problems that show up constantly in real engineering documents: timelines, database relationships, and state transitions. If your Markdown files include delivery plans, data models, onboarding flows, workflow states, or product behavior, these three Mermaid diagram types are worth knowing. They let you keep diagrams close to the text, review them in pull requests, and update them without exporting a new image from another tool. 1. Gantt Diagrams: Roadmaps That Stay With the PlanGantt charts are not only for project managers. They are useful whenever a technical document needs to explain work…