A Mermaid filetype refers to a text-based file that contains diagram definitions written in Mermaid syntax, a lightweight markup language for generating flowcharts, sequence diagrams, Gantt charts, and more — all from plain text.

📁 Common Mermaid File Extensions
Extension	Description
.mermaid	Recommended extension for Mermaid diagram files
.mmd	Alternative extension (used by some editors)
These files are typically used with tools or plugins that support Mermaid rendering, such as:

Markdown editors (e.g., Obsidian, VS Code)

Static site generators (e.g., Docusaurus, MkDocs)

IDE plugins (e.g., JetBrains Mermaid plugin)

📄 MIME Type
The recommended MIME type for Mermaid files is:

text/vnd.mermaid
This is currently pending official IANA recognition.
