Mock Data GeneratorReproducible
Generate realistic test data as JSON, CSV, SQL, a runnable fake REST API or an OpenAPI spec — with a seed, so the same fixture comes back every time.
Why the seed matters
Give a seed and the generator becomes deterministic: the same seed always produces byte-identical data. Test fixtures that change on every run make failures irreproducible — the bug you saw once is gone the next time you look, and nobody can tell whether a fix worked or the data simply moved.
The Fake REST API format emits a file json-server can serve directly, with GET, POST, PUT, PATCH and DELETE on the collection and no further configuration. It downloads as db.json because that is the name the tool expects.
Frequently asked questions
What does Mock Data Generator do?
Realistic test data as JSON, CSV or SQL — seeded, so fixtures are reproducible. The whole thing runs in your browser tab, so it is ready the moment the page finishes loading.
Is Mock Data Generator free to use?
Yes. Mock Data Generator is completely free on ToolMunch — no trial, no premium tier holding back the main feature, and no daily or hourly cap on how many times you can use it.
Do I need to create an account or sign up?
No. There is no account, no email address, and no login. Open Mock Data Generator, do the job, and take the result — nothing is gated behind a signup form.
Is the code I paste in sent to a server?
No. Mock Data Generator runs entirely inside your browser tab, so the code you paste stays on your own device. Nothing is uploaded, which means there is no copy of it on a server to worry about.
Does Mock Data Generator work on Mac, Windows, and phones?
Yes. Mock Data Generator runs in any modern web browser on Windows, macOS, Linux, Chromebook, Android, and iOS. There is nothing to download or install.
Can I use it as many times as I want?
Yes. There is no queue, no per-hour quota, and no counter that runs out — run Mock Data Generator as often as the work needs.