mermaid-js/mermaid · error · Error

No such shape: ${doc.shape}. Shape names should be lowercase

Error message

No such shape: ${doc.shape}. Shape names should be lowercase.

What it means

Error "No such shape: ${doc.shape}. Shape names should be lowercase." thrown in mermaid-js/mermaid.

Source

Thrown at packages/mermaid/src/diagrams/flowchart/flowDb.ts:238

    }
    if (classes !== undefined && classes !== null) {
      classes.forEach((s) => {
        vertex.classes.push(s);
      });
    }
    if (dir !== undefined) {
      vertex.dir = dir;
    }
    if (vertex.props === undefined) {
      vertex.props = props;
    } else if (props !== undefined) {
      Object.assign(vertex.props, props);
    }

    if (doc !== undefined) {
      if (doc.shape) {
        if (doc.shape !== doc.shape.toLowerCase() || doc.shape.includes('_')) {
          throw new Error(`No such shape: ${doc.shape}. Shape names should be lowercase.`);
        } else if (!isValidShape(doc.shape)) {
          throw new Error(`No such shape: ${doc.shape}.`);
        }
        vertex.type = doc?.shape;
      }

      if (doc?.label) {
        vertex.text = doc?.label;
        vertex.labelType = this.sanitizeNodeLabelType(doc?.labelType);
      }
      if (doc?.icon) {
        vertex.icon = doc?.icon;
        if (!doc.label?.trim() && vertex.text === id) {
          vertex.text = '';
        }
      }
      if (doc?.form) {
        vertex.form = doc?.form;

View on GitHub (pinned to d93e9c88c0)

When it happens

Trigger: Thrown at packages/mermaid/src/diagrams/flowchart/flowDb.ts:238 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of mermaid-js/mermaid@d93e9c88c0 (2026-08-12). Data as JSON: /api/errors/5602821bec2e1048. Report an issue: GitHub.