Schema Builder
Start from a template
Users
Products
Orders
Blog posts
Analytics events
Empty schema
Rows
Seed
The same seed always produces the same data — commit it and your test fixtures stay stable across runs.
Fields
Add field
Output shape
Array of objects
Wrapped in a data envelope
Paginated API response
NDJSON (one object per line)
Object keyed by id
TypeScript interface + data
Formatting
Pretty-print
Two-space indentation. Off gives minified output.
Sort keys alphabetically
Generated JSON
JSON
Preview table
Types & schema
data.json
Copy
Download