What schemas can I paste into the seed data generator?

TypeScript interfaces or types, SQL CREATE TABLE DDL, and compact sketches like users(id, email, role).

How do I convert the JSON output to CSV?

Copy the JSON into Codeground’s JSON ↔ CSV converter for a quick export.

Test data

Schema → Fake Seed Data

Paste a TypeScript interface or SQL DDL and get realistic JSON rows for fixtures, demos, and local DBs.

Privacy: Runs on Codeground's self-hosted AI. Schema text is not stored.

AI can make mistakes. Please review important output before you rely on it.

Schema

Rows

Locale

361 / 12000 chars

Fixtures that match your types

Hand-written mock data drifts from the real schema. Paste a TypeScript interface, Zod-ish shape, or CREATE TABLE DDL and get realistic JSON rows for tests, Storybook, demos, and local databases — with notes about assumptions the model made.

Supported schema styles

TypeScript interfaces / types with unions, optionals, and nested objects.
SQL DDL — one or more CREATE TABLE statements (output keyed by table).
Compact sketches like users(id, email, role) when you need speed over precision.

How to generate seed data

Paste the schema. Prefer real field names over foo / bar.
Choose row count and locale (affects names, emails, and formatting).
Click Generate seed JSON and copy into fixtures or a seed script.
Check the notes list — fix any invented foreign keys or enums before shipping.

Schema seed data FAQ

Is the data real PII? No. Values are invented. Still avoid pasting production dumps into the schema field.

Multi-table SQL? Yes. Related tables are returned as an object keyed by table name when possible.

Can I get CSV instead? Copy the JSON into JSON ↔ CSV for a quick conversion.

Deterministic IDs? Not guaranteed across regenerations. Pin IDs in tests if you need stability.