Erdus

This content originally appeared on DEV Community and was authored by Tobias

An open-source universal ER diagram converter

Drag & drop → convert → copy SQL/Prisma instantly.

Every tool speaks a different schema language.

Moving from ER diagrams → SQL → Prisma (or JSON Schema) often means hours of manual rewriting and the risk of losing important details.

I built Erdus to change that — a universal converter powered by a strict Intermediate Representation (IR) designed to unify database models.

What Erdus does

• ERDPlus (old/new) IR
• IR → PostgreSQL DDL (ready for Supabase)
• IR → Prisma schema
• Loss report → transparently shows when features can’t be mapped (e.g. CHECK constraints in Prisma).

Runs 100% client-side: your files never leave your browser.

Why it matters

Whether you’re a student learning database design or a developer juggling multiple stacks, Erdus makes schema conversions:

• Consistent – no surprises between tools.
• Transparent – see exactly what’s preserved and what’s lost.
• Reproducible – one source of truth, everywhere.

And this is just the beginning — the roadmap includes:

• JSON Schema support
• Sequelize / TypeORM outputs
• Supabase policies & identity annotations
• MySQL / SQLite generators

Try it out

• GitHub: https://github.com/tobiager/Erdus
• Live demo: https://erdus-inky.vercel.app/
• Product Hunt: https://www.producthunt.com/posts/erdus

Screenshots

Join the journey

Erdus is open source, and this is only the first step.

If the idea resonates with you:

• Star it on GitHub
• Report issues or suggest features
• Contribute to make schema conversions even better

Let’s make working with ER diagrams and database schemas simple, reliable, and open for everyone.

This is just the beginning — feedback, stars and contributions are more than welcome .

This content originally appeared on DEV Community and was authored by Tobias