Seeded JSON fixture generator

Create deterministic test records from a small field specification. Repeat the same seed and schema to reproduce the same dataset.

01 Input

YOUR INPUT

02 Output

LOCAL RESULT

QUICK GUIDE / 27

How to use

Select Load example to restore the sample, or replace the labeled inputs with your own values.
Review the options and select Run tool. No input is sent to a server.
Supported field kinds: sequence, name, email, boolean, integer:min:max and choice:a|b|c.
Inspect the result, then copy or download it. Clear removes visible inputs and output.

A worked example

Load example restores these values.

Field specification (JSON object):
{"id":"sequence","name":"name","score":"integer:0:100","active":"boolean"}

Seed:
demo

Number of records:
5

Expected result

Five records with sequential ids 1–5, synthetic names, scores between 0 and 100 and boolean active fields. Repeating seed demo gives identical output.

Scope & limitations

Synthetic fixtures only; email addresses use example.com. Maximum 1,000 records. The seeded PRNG is not cryptographically secure. JSON numbers use JavaScript binary64 precision; keep large exact identifiers as strings. Numeric overflow is rejected.

Preparing offline tools…Everything runs on your device.

Seeded JSON fixture generator

01 Input

02 Output

Related tools

Cron schedule explorer

Log filter & field extractor

Stack trace organizer