Mermaid error
A vertical bar inside a node label is edge syntax
Reproduced on Mermaid 11.17.2 · Updated
A vertical bar inside a node label is edge syntax in Mermaid. The exact parser message, why it happens, and corrected source that renders.
What Mermaid says
Parse error on line 2:
...owchart TD A[Cost | USD] --> B[Next]
----------------------^
Expecting 'SQE', 'TAGEND', 'UNICODE_TEXT', 'TEXT', 'TAGSTART', got 'PIPE'Why it happens
The vertical bar introduces an edge label. Inside an unquoted node label it ends the label and the parser expects an edge instead.
The source that fails
flowchart TD
A[Cost | USD] --> B[Next]How to fix it
Quote the label, or replace the bar with a word such as “or”.
flowchart TD
A["Cost | USD"] --> B[Next]Next steps
Paste your own version into the Mermaid repair tool, which applies this correction and fourteen others and shows every change. The related page covers the surrounding syntax, and the error dictionary lists every message.