Mermaid Chart
Official spec by Mermaid
Mirrored990.1.0These are the subset of MermaidChart APIs that's required to create plugins to display diagrams for users.
User authentication SHOULD be done using OAuth, with the PKCE flow.
The clientID and redirectURL should be registered by submitting a request to the MermaidChart team.
Mermaid has not changed this API since Sep 24, 2026. spec0 re-reads the official specification every week, and anything that moves shows up here.
See the full changelogEvery endpoint, parameter and schema this API declares, rendered from the specification itself.
Read the API reference- Official docs
- mermaid.ai
- Spec source
- raw.githubusercontent.com
- Licence
MIT- Updated