SQL to Mermaid erDiagram Converter

Overview

Mermaid renders ER diagrams natively in GitHub, GitLab, Notion, and most static-site generators — but writing the syntax by hand is slow. Paste any number of CREATE TABLE statements and MetaDataLoop emits Mermaid erDiagram markup with column types, primary keys (PK), foreign keys (FK), and detected relationships drawn as ||--o{ etc.

What you get

Example

CREATE TABLE users (
    id INT PRIMARY KEY,
    email VARCHAR(255)
);

CREATE TABLE orders (
    id INT PRIMARY KEY,
    user_id INT,
    total DECIMAL(10,2),
    FOREIGN KEY (user_id) REFERENCES users(id)
);

erDiagram
    users ||--o{ orders : has
    users {
        int id PK
        varchar email
    }
    orders {
        int id PK
        int user_id FK
        decimal total
    }

Frequently asked questions

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