Mermaid diagram checker
Identify Mermaid types, check brackets, quotes and arrows, and count nodes and edges.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Mermaid text
Diagram check
Shows type, node and edge counts.
Enter a diagram definition to check
Type: 0 · Nodes: 0 · Edges: 0
What this tool does
- Check flowchart text quickly
- Count nodes and connections
Example
Input
graph TD A-->B
Output
graph TD A-->B
This tool checks structure; diagram rendering is loaded on demand.
Frequently asked questions
Which diagrams are supported?
Common graph, sequence, class, pie and gantt types are recognized.
Does it run Mermaid?
The default path only performs pure logic checks.
Are single arrows accepted?
Strict mode reports the common invalid single-arrow form.
Keywords：Mermaiddiagramflowchartgraphsyntax