Rows, not model output
Every value is built by a seeded local engine from curated fictional pools. The same schema and seed always produce the same rows.
Test data studio / v1.0
Test Data
Generator.
Compose realistic, deterministic test data in seconds. Define columns, simulate gaps, then export clean CSV, JSON, or TOON — or call the API.
01
Schema
Define your columns
Derive from example
Drag to reorder
02
Output
Live preview
Generating
No preview yet
Generate a preview to see how your rows will look.
The first rows of your export, generated locally.
03
Under the hood
Deterministic rows. AI optional.
Local engine
Coherent by construction
Names, emails, companies, and locations are drawn together and paired consistently, so related fields make sense in the same row.
AI only drafts the schema
A connected model can suggest fields and types. LogicFlow validates them, then generates every preview and export locally.
No AI provider required for the schema builder, example-data parsing, previews, or exports. Presets and CSV/JSON/XML inference are rules-based.
04
Developer API
Data, on demand.
Send a schema, receive a generated file. The API uses the same deterministic engine as the builder — perfect for fixtures, demos, and seed data.
POST
/api/generate
Generate a file
POST
/api/preview
Inspect rows as JSON
POST
/api/derive
Infer from example data
POST
/api/ai/schema
AI schema · key required
GET
/api/types
Field catalog
GET
/api/health
Status check
Base URL
http://localhost:4310
Runs locally. Nothing is sent to a third party.
Preview and export share the same seed.