Mermaid Preview renders flowcharts and other Mermaid diagrams from a textarea by dynamically importing mermaid@10 from the jsDelivr CDN.
What Mermaid Preview does
Loads Mermaid on demand and draws SVG into a preview panel with clear failure messages.
- Textarea for Mermaid source
- Dynamic ESM import from jsDelivr
- SVG render target
- Error message on invalid syntax or CDN failure
- Strict securityLevel initialization
Who Mermaid Preview is for
- Developers documenting architectures
- Tech writers embedding diagrams in docs
- Students learning Mermaid syntax
- Teams reviewing PR diagram snippets
How to use Mermaid Preview
1. Paste Mermaid source such as a flowchart.
2. Click Render.
3. Allow the CDN script to load on first use.
4. Fix syntax if an error message appears.
Features
- mermaid@10 ESM CDN path
- No bundler required in the module
- Local source editing
- Visible errors instead of silent blanks
Examples
- flowchart LR A-->B quick sketches.
- sequenceDiagram samples for API calls.
- Iterate syntax until the SVG looks right.
Tips and limits
- First render needs network access to jsDelivr.
- Very large diagrams may be slow in the browser.
- This preview does not export PNG by itself; screenshot or SVG copy as needed.
- Prefer strict diagrams without HTML injection features.
Related tools
- Markdown Preview for prose beside diagrams.
- SVG Optimizer if you export SVG elsewhere.
FAQ
Why must the CDN load?
Mermaid is fetched dynamically so the tool page stays light until you render.
What if render fails?
The status alert shows the Mermaid or network error message.
Is my diagram uploaded to BeeForge servers?
No. Source stays in the browser; only the CDN library is fetched.
Extra notes
Mermaid Preview runs entirely in your browser so drafts and secrets never need to leave your device for processing. Keep a backup of long outputs in your own notes if you rely on them for production servers or live events. Accessibility friendly labels come from the module UI strings, and the layout follows the shared BeeForge .bf-tool shell for consistent spacing and buttons.
Support for developers, marketers, and everyday users is the same client-side model: open the page, configure options, copy or download, then paste into your workflow. BeeForge related links on the tool page point to companion utilities so you can move between related generators without hunting the hub.
When you share results with a teammate, paste into a ticket or gist rather than screenshotting alone, so the text remains searchable. If a browser privacy mode blocks clipboard helpers, select the output manually. Local processing also means the tool works offline after the page and scripts have loaded once.
Validate generated configs or hashes in a staging environment before production use. Prefer regenerating secrets after any accidental paste into chat. For teaching sessions, walk through one sample input end to end so students see how live updates and copy buttons behave together.
Bookmark the tool page if you use it weekly. Small habit changes like consistent naming and clear file downloads save more time than hunting another converter. Prefer regenerating after you change inputs rather than editing outputs by hand when the source fields still exist.