Simon Willison • 7/16/2026

Mermaid to Unicode box art (grok-mermaid)

This article introduces a tool that transforms Mermaid diagram syntax into terminal-style Unicode box-drawing art, rendered entirely in the browser via WebAssembly. It supports flowcharts, sequence, state, class, and ER diagrams, with other types falling back to a framed source listing. Users can adjust output width, copy diagrams as text, or generate shareable links. The tool was inspired by exploring the open-sourced Grok CLI coding agent's Rust-based Mermaid renderer, adapted for web use with Claude Code.

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#rust #Webassembly #Mermaid