Database Schema Designer
Visually design a multi-table database schema - tables, columns, primary keys, and foreign key relationships - with SQL and JSON export.
Add tables, their columns, and mark primary/foreign keys - this tool shows the resulting entity relationships and exports the schema as SQL or JSON.
This tool also covers what's sometimes searched separately as a "database schema generator" or "ER diagram generator" - the same multi-table model naturally produces all three: a visual diagram, SQL, and JSON, from one definition instead of three separate builders.
What Is a Database Schema Designer?
A schema designer lets you define multiple tables, their columns, and how tables relate to each other via foreign keys - then visualizes those tables and relationships, similar in concept to an Entity Relationship (ER) diagram, and can export the definition as SQL or JSON.
Why Use This Tool?
Planning a multi-table schema on paper or in your head gets hard to track once foreign keys and relationships multiply. Seeing tables and their connections laid out, then exporting straight to CREATE TABLE SQL, saves a manual translation step.
How to Use It
- Add a table, give it a name, and add its columns with types.
- Mark a column as a primary key, or as a foreign key referencing another table's column.
- Add more tables as needed - the diagram view shows each table and its relationships.
- Export as SQL (CREATE TABLE statements) or JSON (a structured schema definition).
Limitations
This is a lightweight, browser-based designer for common relational schema patterns (one-to-many via a foreign key) - it does not connect to or read from a real database, and very complex relationship types (many-to-many join tables, composite keys) may need manual adjustment after export.