ER Diagram Generator
Turn JSON tables and foreign key relations into a Mermaid diagram and visual preview.
Processing stays in your browser. Draws the supplied schema with one-to-many relationships. It does not inspect a database or infer constraints from SQL.
How to use the er diagram generator
Turn JSON tables and foreign key relations into a Mermaid diagram and visual preview. Complete the schema json fields above, or upload a UTF-8 text file for schema json. Choose Run tool, review the output, then copy or download the result.
Example
users and posts become connected table cards.
Good to know
Draws the supplied schema with one-to-many relationships. It does not inspect a database or infer constraints from SQL.