JSON & CSV test data generator

Build a repeatable fixture

1. Name each field and choose its type. Add or remove fields to match your import.
2. Choose a row count. Enter a seed if you need a reproducible test.
3. Generate, inspect the first 20 records, then copy or download every row.

Fixtures for forms, tables and imports

Use explicit fixture records to develop a table, exercise an import parser or prepare an API payload. A label and email share the same row number. The example below shows the shape of the default schema, not a live customer record.

[{"id":1,"label":"Fixture 0001","email":"fixture.1@example.test","active":true}]

IDs start at 1. Integers range from 0 to 10000, decimals from 0 to 1000 with at most two decimal places, and dates cover 2026 in YYYY-MM-DD format. Status codes are draft, active and archived. Unicode notes cycle through accents, Arabic, Japanese, quotes and line breaks.

Choose the right export

JSON preserves numbers and booleans in an array of objects. CSV is a flat table with headers, commas, doubled quotes and CRLF record endings. CSV downloads include a UTF-8 BOM for spreadsheet import; copied CSV has no BOM. Spreadsheet software decides how to interpret types.

Keep the seed, field names, types and generator version fixture-v1 with your test. Reordering fields preserves their values; changing a field name or type changes that field’s sequence. Dates never depend on the current clock. The seed is for repeatability, not security.

Scope and limits

Up to 5000 rows and 16 flat fields. Generation uses a worker where available, otherwise small yielding batches. Cancel stops unfinished work. There are no nested schemas, custom distributions, database writes or load-test guarantees. Output stays in memory and disappears on refresh. No postal addresses, real identities, bank accounts or payment identifiers are generated.

Frequently asked questions