Mermaid error

Double quotes inside a quoted label

Reproduced on Mermaid 11.17.2 · Updated 11 September 2026

Double quotes inside a quoted label in Mermaid. The exact parser message, why it happens, and corrected source that renders.

What Mermaid says

Parse error on line 2:
...TD  A["He said "go" now"] --> B[Next]
----------------------^
Expecting 'SQE', 'DOUBLECIRCLEEND', 'PE', '-)', 'STADIUMEND', 'SUBROUTINEEND', 'PIPE', 'CYLINDEREND', 'DIAMOND_STOP', 'TAGEND', 'TRAPEND', 'INVTRAPEND', 'UNICODE_TEXT', 'TEXT', 'TAGSTART', got 'STR'

Why it happens

The second double quote closes the label. Whatever follows is read as syntax rather than text.

The source that fails

flowchart TD
  A["He said "go" now"] --> B[Next]

How to fix it

Use single quotes inside the label, or the HTML entity for a double quote.

flowchart TD
  A["He said &quot;go&quot; now"] --> B[Next]

The corrected source, rendered with Mermaid 11.17.2.

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.